ATC and Measure Automatic temperature compensation. 010 C density measurement range: 1.01.070. minimum scale is 0.001 concentration measurement range: 0100. minimum scale is 1 Fully equipped with a rigid box. of a drip. with a screwdriver and a cleaning cloth Measures on 2 scales Density (D 20/20) and parts per thousand and replaces your poor quality and difficult to read hydrometer Multiple applications The refractometer is widely used for management of concentration in fisheries. seawater used in aquaculture farms. seawater or artificial water used in aquariums. the brine used for the storage of fish. etc After-Sales Warranties provides an 18-month warranty for the product. If you have any problems. please contact us.