Description This test pen is used to detect TDS values, conductivity and temperature Scope of application: It is used as a testing tool for drinking water quality in the water industry, drinking water industry, households, individual home travel, field operations, etc. Easy maintenance, keep the electrode clean, cover the electrode protector, if not used for a long time, please take out the battery Packing with leather,the small size and lightweight make it easy and convenient to carry. The LED screen makes this water quality tester display the water quality convenienttly. Specifications: Product Name: 3 in 1 multi-function detection pen Battery type: 3V button battery TDS test range: 0~9999PPM Conductivity test range: 0~9990US/CM Temperature test range: 0.1C~80.0°C Accuracy: ±2% Influencing factors: Water temperature: TDS pens are not used to measure high temperature water (eg hot water). Water flow rate: TDS pens are not used to measure large water bodies. Area: Each region and city has different TDS values due to different pipelines and water sources. Note: Because of the resolution of the screen, the color may be a little different. There may be some errors in size due to the way of measurement. Package included: 1* 3-in-1 water tester. 1* leather. 1* English user manual.