Digital Hand-held "Pocket" Copper sulfate (Concentration) Refractometer PAL-53S

>about the icons Model PAL-53S Cat.No. 4453 Measurement Range Copper sulfate (Concentration) 0.0 to 20.0% Temperature 10.0 to 40.0°C Resolution Copper sulfate (Concentration) 0.1% Temperature 0.1°C Measurement Accuracy Copper sulfate (Concentration) ±0.2% Temperature ±1°C Ambient Temperature 10 to 40°C Measurement Time 3 seconds Power Supply 2 × AAA Batteries International Protection Class IP65 Dust-tight and Protected against water jets. Dimensions & Weight 55(W) ×31(D)×109(H)mm, 100g Optional • PAL-CASE : RE-39409 • STRAP: RE-39410 Patent for Design Registration No. ZL200310103015.2 (China) Patent for Invention Registration No. ZL03303431.1 (China), 089244 (Taiwan) Registration pending in U.S.A., and Germany and all other countries around the world.