1、The high‑quality high‑purity platinum sensor is designed to ensure accurate and stable measurement values within the full range. Compact size, portable, light weight and easy to carry around, convenient to use. 2、Automatic calibration function, you only need to enter the known conductivity value in the instrument and immerse the sensor in the calibration solution, press the ENTER key, the instrument will automatically calibrate. 3、It has a simple measurement value lock function. In the conductivity measurement mode, press the HOLD key, the instrument will automatically lock the current measurement value, and press the key again, and the instrument will return to the measurement mode. 4、Save power, with automatic shutdown program. When the instrument is turned on, it will enter the measurement state. If you do not operate any keys for a long time, the instrument will automatically turn off the power. 5、It has good waterproof performance, and each structural connection point of the instrument has been waterproofed, even if it is placed in water, it will not affect the use. At the same time, the weight of the instrument is calculated by the suspension force, and it can float by itself when immersed in water. 1 x TDS/EC Meter1 x Instruction Manual1 x Pack Cover Item Type: TDS/EC MeterMaterial: ABSColor: As shown in the pictureWeight: Approx.70g/ 2.5ozBattery: CR2032 button battery 230mAh (included)TDS Detection Range: 0-4999ppmEC: 0-9999μsError: ±2%Temperature Detection Range: 0-99℃ (32-212℉)Error: ±2℃Backlight: TDS<40ppm green light, TDS≥40ppm red lightHow to Use 1. Take off the pen cover and turn on the switch. 2. Put the pen into the solution to be tested, the height of the solution should not exceed 4cm (from the end of the pen). 3. Gently stir the pen in the solution to be tested for a few times, and wait for the reading to stabilize. 4. After use, wipe off the water in the pen tip with a cloth, and put the pen back into the pen cover.