The electricity liquid densimeter once uses the plan explaining that float to leave the factory according to national standard meterage bureau (glass floats to count verification regulation) by that the factory checkout qualified , is allowed. 1. Various glass floats to count allowable error in order +- 1 minimum graduates. 2. Fu You thermometer various floats to count temperature error in order +- 1 minimum graduates 3. Use front to must be settled wiping away a cleaning , being not able to use personally direct sassafras to wipe away. 4. Superficial the plan and page of face touch a place , due fine that crescent moon face. 5. When liquid does not accord with to floating to count a standard, should send metrological service to give adjustment. Pretend within two: 100 cover Package box size:65 x36x58cm gross weight: 17 kg net weight: 11.3 kgs