1EC, CF and PPM can be measured and high conductivity measurements can be made for a variety of crops without recalibration. 2As long as the probe is immersed in the nutrient solution, the instrument will measure automatically. The readings are immediately displayed in an intuitive and easy-to-read waterproof LED light scale. 3Suitable for hydroponics, fish tank, aquariums, farmland, swimming pools, aquaculture, laboratories and industrial wastewater. 4Compact pen-shape design, lightweight for mobility, you can test water anywhere to get the purest water. 5The water temperature is automatically compensated to 25 during the measurement, it can provide you with an accurate and stable reading. Condition: 100% Brand New Item Type: Water Quality Tester Material: ABS Color: White+Gold Measuring Range: 0.4~5.2EC 4-52cf 280~3640ppm (EC x 700) 200~3000ppm (EC x 500) 0.4-4.4EC 4-44cf 280-3080 PPM (EC x 700) 200-2200 PPM (EC x 500) 140-2520ppm (EC x 700) 100-1800ppm (EC x 500) Accuracy: 4% Resolution: 0.1ec 1cf 70ppm 700 50ppm 500 Operating Temperature: 0~50 (32~122F) Battery: 3 x AA Battery (not included) Size: Approx. 415 x 23mm / 16.3 x 0.9in Weight: Approx. 243g / 8.6oz Operation: 1. Heat the sensor head and put the probe into the nutrient solution for 1-2 minutes to reach the temperature of the nutrient solution. 2. Measure electrical conductivity, simply remove the rod from the solution and place it back in place for 1-2 seconds. 3. Read the conductivity value, remove the rod from the solution, and read the indicator light value on the valve stem. 1 x Water Quality Tester 1 x Instruction