Features:100% Brand new and high qualityThis item can be used in: water purifiers and filters， food (vegetable， fruits) & drink quality monitoring， pools and spas， aquariums， hydroponicsSpecifications:Hold function: Saves measurements for convenient reading and recordingAuto-off function: Turns off meter after 10 minutes of non-use to conserve batteriesDual Range: Measures form 0-999ppm， with a resolution of 1ppm. From 1，000 to 9，990ppm， the resolution is 10ppm， indicated by drinking x10image， Factory calibratedRange: 0-9990ppmAccuracy: +/-2%Battery: 2 x 1.5V Button Cell batteryItem size:156mm x 30mm x 20mm(6.1 x1.2 x0.9in)Net weight:49gWeight:59gNote: It will display only three digits. When the measured results is more than 999ppm， the screen display will be "xxx *10". For example， ��2000�� will appear as ��200*10�� in the screen.Package Included:1 x TDS Meter TesterNote: Do not drop the entire TDS meter in water of dip beyond the maximum immersion level. This unit is not water-tight and is not covered under the warranty if water enters the unit.