ITEM NAME:Digital TDS 3 Water Quality Tester Purity Meter TEMP PPM Test Filter Pen S QXZ Descriptio n Specifications: Measurement range: EC:0â€â€9990Ous/cm; TDS:0-9990ppm; Dearees Celsius: 0.1-80.0 Celsius Fahrenheut: 32.0-176.0 Accuracy:  ±2% Size: 154mm*30mm*14mm Color: White How To Use: Please unplug the electrode sleeve before use. Press the switch ,place the electrode into the testsolution. After the numerically stable ,press the HOLD button and take it out of the solution to read. After reading ,turn off the meter ,wipe clean the electrode before sleeving it. Note: Keep the electrode clean ,cover the electrode protective sleeve ,please take out the batteries for long periods idle. This product requires a 3V CR2032 button battery, but We do not provide it,please kindly note. Package content: 1x Water Quality Tester We offer you what you need! Electric TDS Meter Water Quality Tester TDS EC Meter Hydroponics Aquarium Test.1x Water Quality Tester. Accuracy:  ±2%. We want to make sure you are happy with our item. Goods without RMA number will NOT be accepted. Press the switch ,place the electrode into the testsolution.