Expert Quality. Precision refractometer suitable for measuring urea concentration in AdBlue® diesel exhaust fluid. Will also measure anti-freeze strength. Focusable eyepiece and Automatic Temperature Corrected (ATC) prism ensures accuracy. Designed for use with standard ethylene glycol and propylene anti-freeze. Supplied with calibration screwdriver, calibration fluid, pipette and cleaning cloth. Refractometer measuring range: urea 0 to 40%, antifreeze 0 to-50°C. Packed in storage case. Features and BenefitsExpert QualityPrecision refractometer suitable for measuring urea concentration in AdBlue® diesel exhaust fluid and will also measure anti-freeze strengthFocusable eyepiece and Automatic Temperature Corrected (ATC) prism ensures accuracyDesigned for use with standard ethylene glycol and propylene anti-freezeRefractometer measuring range; Urea 0 to 40% antifreeze: 0 to - 50°C;Supplied with calibration screwdriver, calibration fluid, pipette, cleaning cloth and stor