Product Description Material: ABS Size: 15.5*3.1 cm Temperature range: 0-55 degrees Celsius Monitoring range: 0-9990 ppm/s/cm Test items: TDS value, conductivity, Celsius/Fahrenheit Color: blue Quantity: 1 piece Package content: 1 x water quality test pen 1. QUICK MEASUREMENT: The measuring device is able to measure the electrical conductivity of the water (EC). The number of dissolved solids TDS (Total Dissolved Solids) can also be determined from this value. 2. THREE DIFFERENT MODES: Switch between outputting the results in TDS (ppm) or EC (s) at the push of a button. In addition, the device is able to indicate the temperature of the measured liquid in Celsius or Fahrenheit. 3. ACCURATE MEASUREMENTS: The TDS & EC measuring device measures the conductivity (EC) from 0-9990 s/cm and the TDS value from 0-9990 ppm, resolution: 1 s/ppm from 0-999, 10 s/ppm from 1000-9990. The accuracy of the measuring device is ±2%. Long battery life and low power consumption; automatic shutdown function helps conserve battery power. 4. IMMEDIATELY READY FOR USE: The conductivity meter is pre-calibrated at the factory. After turning on, you can begin measuring immediately. Recalibration is possible at any time using the adjustment screw on the back of the device. Helps monitor water quality and indicates when it may be time to replace water filters. 5. LOCK READING & EASY RECORDING: Hold function allows for easy reading and recording of results. Features a large, easy-to-read LCD screen with data hold capability. The bright display enhances visibility in low light or bright conditions.