11 best digital gemstone refractometers
Digital gemstone refractometers are specialized instruments used in the field of gemology and jewelry appraisal to determine the refractive index of gemstones. The refractive index is a critical optical property of gemstones that helps identify and classify them based on their optical characteristics. These refractometers are essential tools for gemologists and jewelers as they provide valuable information for gemstone identification and authentication. Here are some key features and aspects of digital gemstone refractometers:
Refractive Index Measurement: Digital gemstone refractometers measure the refractive index of gemstones, which is a fundamental property that describes how light is bent or refracted as it passes through the gemstone.
Digital Display: Unlike traditional refractometers, which use a scale or analog reading, digital gemstone refractometers have a digital display that provides a precise numerical value for the refractive index. This makes readings more accurate and easier to interpret.
User-Friendly Interface: These refractometers often come with user-friendly interfaces that allow gemologists to input data and obtain results quickly and efficiently.
Built-in Light Source: Many digital gemstone refractometers include a built-in light source, such as an LED, to illuminate the gemstone sample, making it easier to observe and measure the refractive index.
Sample Holder: They typically have a sample holder or stage where the gemstone is placed for measurement, ensuring that it is properly aligned and held securely during the testing process.
Portability: Digital gemstone refractometers are usually compact and portable, making them suitable for use in various settings, including gemstone markets, jewelry stores, and gemological laboratories.
Gemstone Identification: By measuring the refractive index, gemologists can compare the obtained values to reference data for various gemstone species. This aids in the identification and differentiation of gemstones, especially when combined with other gemological tests.
Accuracy and Precision: These refractometers are known for their accuracy and precision in determining the refractive index, which is crucial for distinguishing between gemstone varieties that may appear similar visually.
Gemstone Authentication: Digital refractometers play a vital role in verifying the authenticity of gemstones.They can help detect certain gemstone treatments or synthetics based on variations in refractive index.
Price Range: The cost of digital gemstone refractometers can vary depending on their features and quality. High-quality models with advanced capabilities may be more expensive than basic ones.
In summary, digital gemstone refractometers are indispensable tools for gemologists and jewelers to assess the optical properties of gemstones accurately. They are essential for gemstone identification, classification, and authentication, helping professionals make informed decisions in the jewelry and gemstone trade.
Below you can find our editor's choice of the best digital gemstone refractometers on the market
Atago 3810 (PAL-1) Digital Pocket Refractometer, 0-53% Brix
Atago
Product description
These lightweight, compact pocket refractometers are ideal for determining Brix concentrations in fruits and beverages as well as cutting oils and organic samples. Out in the field or indoors, Brix measurements can be done quickly and accurately. Simply apply two to three drops of sample onto the prism, press the start key and the Brix percentage value is displayed in three seconds. Calibration is simple - clean off the prism, add water and press the start key. Easy-to-read LCD eliminates the possibility of interpretation errors. * Digital display is easy to read* Compact size for one-handed use and easy portability* Extended Brix ranges provide operator flexibility* Rugged IP65-rated design is ideal for field use and offers easy cleanup* Automatic temperature compensation of 50 to 167°F (10 to 75°C) Compact, durable unit provides simple and accurate Brix readings Lightweight and compact pocket refractometers are ideal for determining Brix concentrations in fruits and beverages, cutting oils, and organic samples. Use in the field or indoors, measurements are quick and accurate.
User questions & answers
| Question: | Is this refractometer good for testing different oils in water |
| Answer: | Dear customer, Thank you very much for waiting. We tested the kombucha today. When we use the handheld refractometer （0-32 % brix ）, we found that our vision was blurred because there were more mixtures in the kombucha. Then we tested it with a digital refractometer （0-50 % brix）, and the result was the same as that of the handheld refractometer, which was about 4.1%brix. If you want to know the quality of kombucha, you can use the mixture index to see the result because the kombucha is a mixture liquid, such as specific gravity, density, %brix. You can use the %brix as an indicator of the quality of kombucha. However, with a handheld refractometer, it's not easy to see the results. Any questions, Please let us know. |
| Question: | i purchase this product to use with honey, after i set in zero y load the honey on the chamber and it mark HHH is this ok? how should i use |
| Answer: | It does not require a battery. |
| Question: | What is the sample holder made out of? Glass? Plastic |
| Answer: | Sorry for the last answer, the one I bought came with olive oil or honey instructions but in this one description you can see they recommend distilled water (same RODI parameters )to calibrate it, so you can do it. |
| Question: | I need to measure the salt content directly in the fish tissues, the device does this |
| Answer: | The measurement may be inaccurate because the salinity of the swimming pool is not good and our products are generally used to test seawater. |
Sper Scientific 300053 Pocket Digital Refractometer, Brix: 0 ~ 95%
Sper Scientific
Product description
Pocket Digital Refractometer Brix 0 ~ 95% Laboratory accuracy in the field. Measure concentrations in brix, salinity and a wide variety of other parameters in the field with laboratory accuracy. As small, light and simple to use as optical refractometers, but with the precision of a digital readout. Reads samples as small as 1 ml. Sample temperature is initially displayed on the large LCD followed by the measurement results. The sophisticated microprocessor provides automatic calibration, automatic temperature compensation and automatic shutoff (after 3 minutes). A sturdy water resistant case protects the electronics from wet environments and makes for easy clean ups. All models feature one button calibration to distilled water and indicate when the battery should be replaced (8000 readings). Comes ready to use with distilled water, transfer-pipet, AAA battery, instructions and a carrying case. Dimensions: 4⅝" × 2⅜" × 1¼" (118 × 62 × 32 mm) Weight: 4.6 oz. (130 g).
- Sper Scientific 300053 Pocket Digital Refractometer Brix 0 ~ 95% Measure concentrations in brix, salinity and a wide variety of other parameters in the field with laboratory accuracy. Brix: 40-95%
- Resolution: 0.1%
- Accuracy: ±0.2%
Milwaukee Instruments MA871-BOX Digital Brix Sugar Refractometer for General Measurements with Protective Padded
Milwaukee Instruments
Product description
The MA871 is an optical instrument that employs the measurement of refractive index to determine the % Brix of sugar in aqueous solutions. The method is both simple and quick. Samples are measured after a simple user calibration with deionized or distilled water. Within seconds the instrument measures the refractive index of the sample and converts it to % Brix concentration units. The MA871 digital refractometer eliminates the uncertainty associated with mechanical refractometers and is easily portable for measurements in the field.
- Country Of Origin: China
- Model Number: MA871-BOX
- Item Package Dimension: 11.599999988168" L x 4.799999995104" W x 2.899999997042" H
- Item Package Weight: 1.55 lb
User questions & answers
| Question: | Will this work with milling machine coolant that may have tramp oil in it |
| Answer: | I am sorry the BAK box will not be able to be used with our Encore installed. |
| Question: | will this work industry to measure ice cream |
| Answer: | I am sorry to say that this part number not be able to be installed with a rack system. |
| Question: | What is the measurement range of this refractometer |
| Answer: | Yes it will fit an 2018 F-150 if you have the 5.5ft short bed. |
| Question: | Can you use this to check s.g. During fermentation |
| Answer: | Just call Extang customer service: 800-877-2588 |
Milwaukee Instruments MA871 Digital Brix Refractometer, Range 0-85%
MILWAUKEE'S
Product description
Milwaukee MA871 Digital Sugar Refractometer with Automatic Temp Compensation, Yellow LED, 0 to 85 percent Brix, +/- 0.2 percent Accuracy, 0.1 percent Resolution is suitable for a wide range of professional applications.
- Range 0-85% Brix
- Resolution 0.1%
- Comes with battery
- Readout Accuracy 0.1 pH-grams
User questions & answers
| Question: | Would I need to check calibration with each measurement I do, or at the beginning of my brew day to check wort which I do several times |
| Answer: | Legs mount inside, but seat turns so one can enter from the outside of tub, then it turns so it can slide and turn to be inside tub. We use this for my 97 year old father. His assisted living staff thinks it is awesome bath chair. |
| Question: | Can this refractometer measure the water content of a ethylene and propylene glycol solution? I need it to check for water contamination |
| Answer: | Majority of people who will use this type of bath chair use a hand held shower head. No you cannot shut a glass shower door if you are using this chair-Or any type of slide in chair.But if you use a hand held shower head, water stays in a close to body. |
| Question: | How does this product compare to the Atago 3810 refractometer |
| Answer: | I don't have the exact measurements because I discarded the cartons awhile ago. But as I remember it may be about 40 x 20 x 6" |
| Question: | What does 0 - 85% brix mean on the specifications? They have another model that does 0 - 50%. Thanks for any insight |
| Answer: | It cannot be decreased. It can only be increased by a 4" extension kit or an 8" extension kit. |
Sper Scientific 300036 Lab Digital Refractometer
Sper Scientific
Product description
Lab Digital Refractometer Clinical Measure concentrations in brix, salinity, refractive index and clinical parameters with full scale accuracy of 0.1% using CCD scanner (= linear scanned array imaging) technology. Simple to use. All models calibrate to distilled water and require a sample of only 0.4 ml. Instantly displays temperature in addition to multiple scales with the unit of measure indicated on the large LCD. The sophisticated microprocessor provides automatic calibration, automatic temperature compensation, automatic shutoff (after 3 minutes), and visual min/max alarms. Low power consumption enables 5000 readings, before the LCD indicates that the battery should be replaced. The water resistant design protects the electronics from wet environments and makes for easy clean ups. Comes ready to use with a 9V battery, distilled water, a transfer-pipet, instructions and a protective case. Dimensions: 7" × 4" × 2½" (180 × 100 × 65 mm) Weight: 18 oz. (500 g).
- Urine Specific Gravity|Serum Protein| Refractive Index
- Calibrate to distilled water and require a sample of only 0.4 ml
- Full scale accuracy of 0.1% using CCD scanner (= linear scanned array imaging) technology
User questions & answers
| Question: | Can it be used for measuring alcohol content by volume |
| Answer: | Most likely it would not be able to be used with a ladder rack. You would most likely need to have full access to the stake pockets to be able to mount the ladder rack. |
Milwaukee MA887 Digital Salinity Refractometer with Automatic Temperature Compensation, Yellow LED, 0 to 50 PSU, +/-2 PSU Accuracy, 1 PSU Resolution
MILWAUKEE'S
Product description
Milwaukee MA887 Digital Salinity Refractometer with Automatic Temperature Compensation, Yellow LED, 0 to 50 PSU, +/-2 PSU Accuracy, 1 PSU Resolution has a number of industrial applications. Samples are measured after a simple user calibration with distilled or deionized water. Within seconds, the refractive index and temperature are measured and converted into one of three popular measurement units; Practical Salinity Units (PSU), Salinity in parts per thousand(ppt), or Specific Gravity (S.G. (20/20))
- Laboratory tested
- Yellow led display
User questions & answers
| Question: | I've had my ma887 for year now. seems to calculate 35ppt at 1.027 s.g. anyone else's unit do this |
| Answer: | I've always just dried it with a cloth or paper towel. Anything really. Been doing it for years |
| Question: | why i get ppm 38 with aqua Craft calibration Solution |
| Answer: | We do. It's just that they use the same UPC code for both and Amazon doesn't recognize the difference. Give us a call for that one. |
| Question: | How do you clean it, after each use? Just rinse it out |
| Answer: | Yes. You can use this meter with the soil "slurry" technique by adding distilled water in the soil sample. |
| Question: | Why don't you carry the hard shell & padded case - Model #MA |
| Answer: | As a rule of thumb, we recommend replacing the one after one year of regular use to ensure the best accuracy. |
Sper Scientific 300035 Lab Digital Refractometer
Sper Scientific
Product description
Lab Digital Refractometer Salinity Measure concentrations in brix, salinity, refractive index and clinical parameters with full scale accuracy of 0.1% using CCD scanner (= linear scanned array imaging) technology . Simple to use. All models calibrate to distilled water and require a sample of only 0.4 ml. Instantly displays temperature in addition to multiple scales with the unit of measure indicated on the large LCD. The sophisticated microprocessor provides automatic calibration, automatic temperature compensation, automatic shutoff (after 3 minutes), and visual min/max alarms. Low power consumption enables 5000 readings, before the LCD indicates that the battery should be replaced. The water resistant design protects the electronics from wet environments and makes for easy clean ups. Comes ready to use with a 9V battery, distilled water, a transfer-pipet, instructions and a protective case. Dimensions: 7" × 4" × 2½" (180 × 100 × 65 mm) Weight: 18 oz. (500 g).
- Sper Scientific 300035 Lab Digital Refractometer Salinity Measure concentrations in brix, salinity, refractive index and clinical parameters with an accuracy of 0.1%. Range: Brix 0~60%| Salinity % 0~28%| Salinity ppt 0-280| Refractive Index 1.3330~1.4419
- Refractive Index
- Measure concentrations in brix, salinity, refractive index and clinical parameters with full scale accuracy of 0.1%
Milwaukee Instruments MA887-BOX Digital Refractometer for Seawater Measurements with Protective Padded Hardshell
Milwaukee Instruments
Product description
The new Milwaukee MA887 Seawater Digital Refractometer encompasses 3 different types of user selected scales for the measurement of seawater providing for a much more precise evaluation. Each scale is temperature compensated.
- Country Of Origin: China
- Model Number: MA887-BOX
- Item Package Dimension: 10.399999989392" L x 4.9999999949" W x 4.799999995104" H
- Item Package Weight: 1.5 lb
User questions & answers
| Question: | Its come with the hard case box |
| Answer: | Yes |
| Question: | Does this come with the additional items shown in the picture |
| Answer: | The rails extend into the bed 2 1/2 inches. If the toolbox is flush and sits to the top edge of the bed, you will not be able to install it with this cover. |
Oakton - AO-35462-11 EcoTestr CTS Pocket Conductivity, Salinity, and TDS Meter
Oakton
Product description
This new addition to the Oakton ecotestr product line features updates to make measuring water quality easier and faster. The display is larger with a better viewing angle, has indicators for battery life, readiness, and calibration, and shows both the parameter and temperature readings at the same time. To enhance field use, the cap was redesigned to be leakproof and can be attached to the top of the meter when not being used no more lost caps! the cap features a fill line, so you know how much sample you need for an accurate reading when using the cap as a sample cup. It is also wider, providing a base to keep the meter upright for hands-free measurements. The keypad now has a fourth key to simplify menu navigation while keeping convenient one-touch calibration. The new housing is compatible with lanyards to prevent losing or dropping, but is still waterproof and Floats just in case. Upgrades to design and function won't break the bank conductivity, TDS, and salinity in one meter expanded 4-digit dual-line display shows conductivity and temperature readings simultaneously additional key provides an easier, more intuitive interface improved cap functions as a sample cup and as a stabilizing base to stand the meter upright IP67-rated housing is waterproof and Floats.
- Display type: dual-line lcd
- Max salinity: 10.0 ppt
- Min salinity: 0.0 ppt
- Tds resolution: 10 ppm, 0.1 ppt
- Temperature compensation: automatic
User questions & answers
| Question: | Where is the menu to set it up to read the salt level on a pool |
| Answer: | There’s A 9-volt battery in it. It will last about 3 years easy. |
| Question: | Does this read ppm of salt |
| Answer: | Measures all minerals, etc dissolved in water. Not a specific element. |
| Question: | Can I change temp reading to Fahrenheit |
| Answer: | kENT, Taken directly from LaMotte's website:Designed for the pool professional. The tester's probe is dipped into a sample of pool water and the results are ready instantly. The Salt PockeTester measures the Sodium Chloride level in salt water pools with a range from 0 to 9,999 ppm. TDS is measured from 0 to 9,999 ppm and Temperature from 32.0° to 149°F. A memory feature saves up to 25 test results. The PockeTester is packages in a rugged carrying case with a special calibration standard. |
| Question: | Can this item test EC value in soil |
| Answer: | My meter was durable, but after 2-3 years water leaked into the battery compartment and caused corrosion. I've used other salt meters, but bought another LaMotte to replace the damaged one. |
Vee Gee Scientific BX-1 Handheld Refractometer, with Brix Scale, 0-32%, +/-0.2% Accuracy, 0.2% Resolution
Vee Gee Scientific
Product description
- Handheld portable refractometer for Brix (0.0 to 32.0%) measurement of sugar content in fruit, juices, soft drinks, coffee and cocoa beverages, lactic beverages, purees, soups, industrial fluids, water-soluble detergents, and aqueous film forming foams (AFFF) for fire fighting
- Manual temperature compensation and calibrated with distilled water using a tool-free calibration ring
- Ambient light illuminates the scale; no additional power source is required
- Durable metal and rubber outer shell with a telescope-shaped, streamlined design (40 x 40 x 165mm), a rubber grip to guard against hand heat for accurate measurements, and a non-roll stand to protect against damage
- Optical glass prism mounted in all-metal housing for quick temperature equilibrium between sample and prism
User questions & answers
| Question: | does it have ATC |
| Answer: | Hi Jan. This unit does not have ATC. If you are looking for ATC with the same scale as this unit we recommend the BTX-1 (Amazon ASIN B004WDRJUU) |
Robinair 75240 Coolant and Battery Refractometer
Robinair
Product description
Robinair's No. 75240 Coolant and Battery Refractometer is designed for use in measuring the freeze point of propylene or ethylene glycol based cooling systems and for checking the strength of electrolyte solution batteries. This precision instrument features high-quality optics with ultra smooth focusing. Scale range: -60 degrees Fahrenheit to +32 Fahrenheit. This handheld refractometer is a portable, precision optical instrument used for measuring the freeze point of engine coolant and the operating state of battery charging liquid. It is used on transportation vehicles, such as cars, tractors, tanks, ships, etc., which use propylene or ethylene glycol for coolant and sulphuric acid for charging liquid. When a liquid (such as coolant or charging liquid) is placed on the prism, the light passing through it is bent. The more concentrated the liquid, the more the light will bend. The refractometer contains a reticle, or scale, that is enlarged through the eyepiece to measure this bent light. The values of the scale have been established to evaluate the coolant or charging liquid. Complete kit includes refractometer with rugged aluminum housing, eyedropper, screwdriver, vial of distilled water, cleaning cloth, foam lined rigid plastic case, and complete usage instructions. Robinair, a Bosch Automotive Service Solutions brand, is a global leader in service tools and equipment based in Owatonna, Minnesota. Robinair is recognized throughout the world as the quality and performance leader in AC/R evacuation tools and this position has led to its success with the full range of products that serve the heating/ventilating/air conditioning/refrigeration (HVAC-R) and mobile markets, which includes the automotive aftermarket along with other industries such as agriculture and construction.
- Robinair's Coolant and Battery Refractometer is designed for use in measuring the freeze point of propylene or ethylene glycol based cooling systems and for checking the strength of electrolyte solution batteries
- Precision instrument features high-quality optics with ultra smooth focusing to ensure reliable, accurate test results
- When a liquid (such as coolant or charging liquid) is placed on the tools prism, the light passing through it is bent - the more concentrated the liquid, the more the light will bend
- Scale range: -60 degrees Fahrenheit to +32 Fahrenheit
- Complete kit includes refractometer with rugged aluminum housing, eyedropper, screwdriver, vial of distilled water, cleaning cloth, foam lined rigid plastic case, and more
User questions & answers
| Question: | does this come with a hard case |
| Answer: | Yes, You will need to use the fab key. It is an exception to the rule. it is the only key you have. |
| Question: | If I use this, should I ignore manufacturer's mileage-based coolant recommendations? Is there any other test that should be performed |
| Answer: | No, it is not a 100% waterproof because of the folding sections. I get some water in the bed from steady rain. I keep things that shouldn't get wet in plastic boxes with lids on them. That being said, overall I am happy with the tonneau. |
| Question: | Just to clarify ,HOAT,OAT and G-05 are also able to be tested |
| Answer: | I would not waste my money. Mine is only 4 years old and is falling apart. I have cracks in the outer top layer that let water inside the cover. some of the hardware has broken in the middle that secures it to the rails. the rails themselves have warped over time and it dose not want to latch down. I started having problems with the cracks at less than a year and when I checked with Extang I found it had to be returned to the factory for service that made the warranty about useless. |
| Question: | Does this unit measure the coolant PH level of a vehicle |
| Answer: | yes, you will have full use of the tailgate without having to open the cover |
| Question: | Will this work with the gem in a setting |
| Answer: | I doubt there's any difference between the '14 (mine) short bed and the '15. Both are 5'8". Extang folks were very helpful to me, so if you're nervous, call them. I'm confident it will fit. I really like the cover...light weight and sturdy. I traded in my second Avalanche and really missed the hard cover. Good luck... but I think you'll be happy. |
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