We are offering online monitor - (ph) etc. Range: 0.00-14.00ph resolution: 0.01ph accuracy: +- 0.1ph t1-t2 =5’c (t1- the environment of temperature t2-the test liquid temperature) power supply: dc 6v (include with adapter) operating temperature: 0’c-50’c dimensions: 112mm*86mm*57mm weight 345g digital display, a external transformer, to 24 hours continuous measurement to avoid battery power caused by low reading power