... in the world. KL-025 Digital Online PH Monitor Kelilong pH,EC,TDS,ORP Testers,Redox readings in ... swimming pools,pH and TDS measurement in Aquariums.Refractometer, Massager ... .01PHAccuracy±0.1pHPower SupplyDC 6V(include), with adaptorOperating Temperature0°C~50°CDimensions60mm×55mm×23mmWeight75g Digital pH Meter Tester Hydroponics Aquarium ATC pH Monitor