Features 1、It adopts high‑definition LCD backlit large screen, which can also be measured at night. 2、IP65 dustproof and waterproof rating, no need to worry about water ingress into components. 3、The ergonomic design is more convenient to use and comfortable to hold. 4、It is widely used in aquaculture, drinking water, swimming pools, aquariums, and food processing. 5、The water quality detector is light in weight, small in size, and easy to carry. Specification Item Type: Water Quality Test Pen Available Functions: PH, TDS, EC, temperature Material: ABS Measuring Range: PH: 0.00-14.00ph; TDS: 1-9990ppm; EC: 0-19990μs/cm Resolution: 0.01 PH; 1ppm; 1us/cm; 0.1°C; 0.1°F Accuracy: PH: +/-0.05ph; TDS/EC: +/-2%; temperature: ±0.5°C Uses: aquaculture, drinking water, swimming pool, aquarium, food processing Battery: 3 x LR44 button battery (battery not included) Package List 1 x 4 in 1 Multi-Function Test Pen (Battery Not Included) 3 x Correction Powder 1 x Manual