Feature: 1. The 5 in 1 multifunctional water quality tester measures PH, TDS, EC, salinity and temperature. 2. High performance, pen shape design, fast numerical stability and accurate calculation result. 3. IP67 waterproof grade, can still be used when dropped into the fish tank, more convenient to use. 4. The probe can be replaced, automatically calibrated, high precision and high reliability, easy to operate. 5. Support for backlight, 5 minutes automatic power off function, light weight, small size, easy to carry. 6. Suitable for aquaculture, drinking water, swimming pool, aquarium, food processing, laboratory, paper industry, etc. 7. The seawater salinity can be measured. The seawater salinity is the ratio of total dissolved solids to the weight of sea salt in seawater. It is usually expressed in g/kg seawater and the measurement range is 10.1-200.0ppt. 8. Light salt salinity can be measured. Light salt refers to light water with a salt content of less than 0.5g/L. The measurement range is 0.00-25.00% and the accuracy is 0.01-5.00%, 5.10-25.00%. Specification: Condition: 100% Brand New Item Type: Water Quality Tester Material: Plastic EC Test Range: 0 to10000uS/cm 10.01-19.99ms 20.1-400mS/CM Resolution: 1uS/cm; 0.1mS/CM Accuracy: ±2% of the reading TDS Test Range: 0 to 1000ppm 1000ppm to 10000ppm 10.1 to 200.0ppt Resolution: 1ppm; 0.1ppt Accuracy: ±2% of the reading Salinity Test Range: 0.00 to 25.00% Resolution: 0.01% Accuracy: 0.01-5.00% (±0.1%) 5.10-25.00% (±1%) pH Test Range: 0.01-14.00pH Resolution: 0.01pH Accuracy: ±0.05pH Temperature Compensation: Automatic Temperature Compensation (ATC) Working Environment: 0 to 60.0℃ (32.0-140℉); RH 100% TDS Factor: 0.4 to 1.0 Temperature Range: 0.1-60.0℃ 32.0-140℉ Temperature Accuracy: ±0.5℃ Temperature Resolution: 0.1℃/℉ Automatic Power-off: 5 Minutes Display: Support Backlight Waterproof Grade: IP67 Power Consumption: 2.9mA, power consumption for shutdown is 0 Feature: Within 150ppt, the accuracy is relatively accurate, while above 160ppt, the deviation is relatively large Battery: 3 x LR44 Button Battery (Not Included) Display Screen Size: Approx. 33 x 24 mm / 1.3 x 0.9 in Product Size: Approx. 183 x 37 x 37 mm / 7.2 x 1.5 x 1.5 in Weight: Approx. 162g / 5.7oz Package List: 1 x Water Quality Tester (Battery Not Included)1 x User Manual Note: Be sure to clean the electrode after each use.The product will automatically turn off after about 5 minutes of bright light, and enter the power saving mode. Press any key and the light will turn on again. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.