What is a Refractometer?

A Refractometer is a precision optical instrument designed to measure the concentration or mixture ratio of water soluble fluids. It measures refractive index, the speed at which light passes through a liquid. The denser the liquid the slower the light will travel through it, and the higher its reading will be on the refractometer. There are four main refractometer types: Traditional Analog Refractometers, Digital Handheld Refractometers, Inline Process Control Refractometers and Refractive Index Sensors, and Desktop, Benchtop or Laboratory Refractometers.

About MISCO Refractometer

MISCO Refractometer, in business for more than 60 years, is a respected industry leader in the field of refractometry. We maintain this leadership position because refractometers are all we do - just refractometers. Refractometers are not just a catalog item or sideline business for us, they ARE our only business. That's what makes us unique.

Our strategy is simple - we are dedicated to making refractometers useful instruments that are easy for people, not just scientists, to understand and use. We do this by demystifying arcane scientific methods and offering real-world solutions for fluid measurement applications. We pride ourselves on being the information warehouse for the refractometer community.

  • Triethylene Glycol Refractometer for Water Content in Gas Dehydration.

    I am interested in the refractometer. We use triethylene glycol for gas dehydration and I would like to know if this meter will tell us the % water in the glycol. We also use amine Ucarsol 302. The amine mix is 50% Ucarsol and 50% deionized water, will the refractometer check this mix? Thank you,

  • Propylene Glycol PG False Positive and Turbidity with Refractometer.

    We have a PA203X refractometer. When using this to test % PG in water, is it possible to get a false positive at low levels (e.g., 0.1, 0.2)? Does the turbidity of the sample have any effect?

  • Refractometer for Testing Percent NaCl, Sodium Hydroxide, Hydrochloric Acid, and Sodium Sulfite.

    Very interested, yet ignorant about this technology. I need reliability in testing % NaCl in water softening applications as well as concentrations of sodium hydroxide, hydrochloric acid, and sodium sulfite. Do I need multiple instruments? Can I get the meter to read in ppm of sodium sulfite? Can the meter(s) read in % saturation of NaCl? I am used to reading hydrometers for all but sodium sulfite, can the instruments give the same read out in % acid or caustic? I really do not understand the BRIX scale and how that will look when all I want is the strength of acid or % saturation of NaCl. Thanks,

  • How to Convert Refractometer Glycol Freeze-Point Readings into Percent Concentration.

    I have some questions about your 7084VP+ MISCO glycol and battery tester. How would I use this refractometer to verify a 30% glycol solution in one of our systems since the unit it reads are in degrees Fahrenheit?

Build Your Own Refractometer

While we pride ourselves in having one of the largest selections of refractometers available, we recognize that every user is different and that there may not be a one-size-fits-all solution to your measurement needs. Build-Your-Own Refractometer allows you to design a custom refractometer to your exact specifications. Just select the desired number of scales, choose protection options, and then add accessories to your design - truly making it your own. When you're done you can choose to print a custom quote or place the order immediately! Give it a try! Of course, call us anytime for personalized service. 866-831-1999


MISCO Wins NEO Success Award

(SOLON, OH – March 26, 2015) We are honored and humbled to be recognized by Inside Business Magazine with the 2015 NEO Success Award for being one of the most successful companies in the region.… [Read More]

Our New Home

(SOLON, OH – July 7, 2014) As we celebrate our 65th Anniversary we are moving to a new home. The new facility is more than twice the size of our previous facility and includes first-class office,… [Read More]

New Beer Refractometer Measures with Unprecedented Precision

ANCIENT TRADITION MEETS CUTTING-EDGE TECH (CLEVELAND, OH – April 7, 2014) An enduring tradition, man’s relationship with beer dates back nearly 7,000 years. And while few human traditions can rival… [Read More]

New Instrument for High-Precision Measurements of Soy Milk Solids and Protein Concentration

(CLEVELAND, OH – April 22, 2013) MISCO introduces their new digital handheld Soy Milk refractometer, engineered specifically for measuring the solids and protein content of Soy Milk. The MISCO Soy… [Read More]

New Modular Smart-Sensors Make Concentration Measurement Simple & Inexpensive

(CLEVELAND, OH – April 15, 2013) Conceptually different than any other inline refractometer available, the patented IRIS™ (Intelligent Refractive Index Sensor) line introduced today by MISCO,… [Read More]

Inline Process Refractometer, Based on New Smart-Sensor, Achieves Five-Fold Increase in Performance

(CLEVELAND, OH – April 8, 2013) The VIP2 inline process refractometer represents one of the latest advancements in smart-sensor technology. Inline refractometers have long been used to measure the… [Read More]

Build Your Own Refractometer

Our Build-Your-Own Refractometer section allows you to design a custom refractometer to your exact specifications. First, select the measurement scales. Next, add options and then accessories to your design. Finally, you can print a custom quote or order immediately. TRY IT NOW!


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Contact MISCO

6275 Cochran Road, Solon OH 44139

Toll Free 866-831-1999

Phone 440-349-1500 

Fax 440-349-1511