Features:Type: Portable Water Quality Tester Accuracy: ±2%Test item: TDS, EC, temperatureTDS: 0~9990PPmWC: 0 ~ 9990 us/cm Temperature measurement range: 0.1~80.0Fahrenheit: 32.0~176.0Power supply: CR2032 battery (3V) X 1 (not included)Size: approx. 3cm x 15.5cm x 1.4cm / 1.1" x 6.1" x 0.5 inchPackage weight: about 60gCE value for referenceDrinking pure water: EC = 1 ~ 10 s/cm Drinking water: CE 2000 s/cm Polluted water: EC ≤ 2000 s/cmTDS range 0026 amp; Standard for reference only0~49 Ideal drinking water50~99 Mineral water100~199 Hard water200~399 Reluctantly acceptable water400~499 Bad water≥500 Polluted water as specified by US EPAPackage includes:1 X Water Quality Tester water (without battery) 1 X User Manual 1 X Free Leather Case Note: Keep the electrode clean, cover the electrode protection sleeve, remove the battery for a long time idling. of reference values" is just for your reference, depends on different requirements, the reference value may be different for people in different countries or regions. Please read the instruction manual carefully before use.【Auto-off 0026 Auto-off 【lock Function】Turn off the meter after 5 minutes of non-use to save battery power, the LCD screen can record measurements. .【Super convenient】Automatic temperature compensation function when the meter is in measurement mode.【Usage】You can switch between TDS and conductivity by clicking the SHIFT button. Press and hold the SHIFT key twice to toggle between Celsius and Fahrenheit. Powered by 1 PC 3V CR2032 battery (not included), which can work continuously for more than 1000 hours.【Save Energy】Powered by 1 PC 3V CR2032 battery (not included), which can work continuously for about 1000 hours.【 【3-in-1 Water Quality Tester】TDS Meter, EC Meter and Thermometer. You can use the mini water quality pen to test the water used for drinking, hydroponics or filling your fish tank. Note: The data are all manual measurement, please allow 1-3cm error, due to the light and display difference, there will be some color difference, depending on the physical object received.