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By certification 
DR602 digital urea concentration AUS32 tester refractometer Can be used to measure the concentration of urea (AUS32) in water.range is 0 to 51%.as well as measuring refractive index of solution.
Urea (NH2)2C0:0-51.0%
Refractive Index:1.3330--1.4056nD
Operation temperature:0.0~50.0 Centigrade(32.0~144.0Fahrenheit)
Power supply:1.5V battery*1
Automatic shut off
Dimensions:121 x 58 x 25(mm)
Net weight:90g (battery not included)
