The RF30 requires only 2 or 3 drops of solution and provides accurate and repeatable measurements on an easy to read scale. Prism and lens with a simple focus adjustment. It comes complete with case, calibration screwdriver, plastic pipette and calibration solution.

Extech RF30 Features:

• Measures the brix concentration in fruit juice, lubricants, cutting and other industrial fluids
• 3 ranges 0 – 41%, 42 – 71%, 72 – 90%
• Compact size, easy to operate
• Provides accurate and repeatable measurements on easy to read scale
• Requires only 2 or 3 drops of solution
• The prism and lens with a simple focus adjustment
• Complete with case, calibration screwdriver, plastic pipette and calibration solution

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Extech RF153 Features:

• Dual LCD simultaneously displays %Brix or Refractive Index (RI) and Temperature
• Wide 0 to 53% Brix measurement range with 0.1% resolution
• Abrasion and corrosion-resistant coating on sapphire prism
• Automatic Temperature Compensation (ATC)
• Water resistant (IP65)
• Zero calibration with distilled or tap water
• Data Hold and Low Battery indicator
• Auto power off (after 2 minutes)
• Store/recall 10 measurements
• Complete with built-in prism cover, wrist strap, 2 AAA batteries, and pouch

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The RF10  requires only two or three drops of solution and comes with the prism and lens which has a simple focus adjustment. The RF10 0 to 32% Brix Refractometer comes complete with a case, a calibration screwdriver, a plastic pipette and the calibration solution.

Extech RF10 Features:

• Compact size, easy to operate
• Provides accurate and repeatable measurements on easy to read scale
• Requires only 2 or 3 drops of solution
• The prism and lens with a simple focus adjustment
• Complete with case, calibration screwdriver, plastic pipette and calibration solution

Extech RF10 Specifications:

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• Compact size, easy to operate
• Automatic Temperature Compensation (ATC) from 10 to 30°C
• Provides accurate and repeatable measurements on easy to read scale
• Requires only 2 or 3 drops of solution
• The prism and lens with a simple focus adjustment
• Complete with case, calibration screwdriver, plastic pipette and calibration solution

Extech RF11 Portable Sucrose Brix Refractometer (0 to 10%) with ATC Specifications:

• Min Brix Range (%) 0
• Max Brix Range (%) 10
• Resolution0.1% (Brix)
• Accuracy±0.1% (Brix)
• Max Temperature Compensation (° C) 30
• Min Temperature Compensation (° C) 10
• Dimensions: 190 x 40 x 30mm (
• Weight: 185g

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The instrument measures the refractive index of the sample and displays the result in parts per thousand (0/00) and specific gravity (d 20/20).

1. Zero Adjustment
Cover the prism with a few drops of distilled water from the included vial. Close the cover plate and rotate the adjusting screw so that the light/dark boundary line (known as the shadow-line) evens up with the zero line. After the zero adjustment, clean the prism with soft cloth.

2. Sample Preparation and Measurement Readings
To take a reading, place a few drops of a sample liquid on the measurement prism. Ensure that enough solution is
added to the prism in order to cover the entire prism. Close the prism so that the liquid spreads across the entire surface of the prism without air bubbles or dry spots. Allow the sample to remain on the prism for  approximately 30 seconds.

While holding the instrument under a light source, look through the eyepiece. The salinity concentration is determined by the intersection of the boundary of the light and dark fields (known as the shadow-line) on the printed scale. The left side of the scale indicates the specific gravity and the right side parts per thousand. If the scale appears out of focus, the eyepiece may be adjusted by rotating the knurled portion.

The instrument also features an eye guard to prevent stray light from entering the eyepiece and causing reflections. It may be necessary to adjust the position of the light source to maximize the contrast of the shadow-line.

Under normal conditions, optimal contrast is obtained by holding the instrument underneath and perpendicular to a light source. Once a reading has been taken, wipe dry with a clean cloth (do not wash or rinse) and place the instrument in the supplied plastic case. Store the instrument in a safe, dry environment.

Extech RF20 Components:

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A refractometer is a simple instrument used for measuring concentrations of aqueous solutions. It requires only a few drops of liquid and is used throughout the food, agricultural, chemical, and manufacturing industries.

When light enters a liquid it changes direction – this is called refraction.

A refractometer measure the degree to which the light changes direction, this is called the angle of refraction. A refractometer takes the refraction angles and correlates them to refractive index (nD) values that have been established. Using these values, you can determine the concentrations of solutions. For example, solutions have different refractive indexes depending on their concentration.

The Extech RF41 Portable Battery Coolant/Glycol Refractometer with ATC (°C) measures the Propylene/Ethylene Glycol freezing point from -50 to 0°C and the Specific Gravity of battery acid from 1.11 to 1.30 and provides a quick reference of battery charge condition.

The Extech RF41 requires only 2 or 3 drops of solution for fast and accurate readings.

Automatic Temperature Compensation provides repeatable measurements on an easy to read scale. Prism and lens with a simple focus adjustment. Includes carrying case and calibration screwdriver.

Extech RF41 Components:

Extech RF41 Portable Refractometer Specifications:

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