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