Product name: 3 in 1 multifunctional detection pen Battery type: 3V (CR2032) button battery TDS test range: 09999PPM Product packaging: leather packaging Conductivity test range: 09990US/CM Product weight: 43G (net weight), 59G (total weight) Temperature test range: 0.1°C80.0°C Accuracy: soil 2% Test items: TDS value test, conductivity test, temperature test Application range: Used in water treatment industry, drinking water industry, family, personal home travel, field work, etc. as a drinking water quality inspection tool. Influencing factors: Water temperature: TDS pen cannot be used to measure high temperature water (e.g. hot water) Water rate: TDS pen can not be used to measure water with large sloshing Region: Each region and city has different TDS values ​​due to different pipelines and water sources Maintenance: keep the electrode clean, cover the electrode protective cover, if it is not used for a long time, please take out the battery Note: Due to different monitor settings, the color deviation may be different, please understand. Due to manual measurement, there will be a certain error, which is a normal phenomenon. If you encounter a problem, please notify us as soon as possible, we will give you the best service and solve the problem as soon as possible. thank you.