Introduction: This digital pen style PH meter is an ideal instrument for any aquarium, the industry, swimming pools, school laboratories, food beverage, etc. And, this Digital TDS Water Quality Tester is ideal for all basic water testing applications. This product is highly efficient and accurate due to its advanced microprocessor technology. Applied range: the production and drinking of purified water, Electroplating liquid, Boiler water, Water in fish tank, Water of swimming pools, Photograph flushing fluid, Well water, Deep phreatic water, Laboratory, Aquaculture, Food processing, etc Features: With compact portable design Excellent PH meter, very accurate and durable This digital pen style pH meter is an ideal instrument for whatever you may need to test the pH levels LCD display screen: Big LCD display screen which has great waterproof performance and let you easily read the displayed value Specifications: Display: LCD Digital Measure Range: 0.00-14.00pH Resolution: 0.01pH Accuracy: ±0.05pH Power Supply: 2 * 1.5V LR44 Batteries(Keep using more than 500 hours) Operating Temperature: 0℃~80℃ Calibration: Two points automatic calibration Size of Digital PH Meter: L*W*H/155mm * 30mm * 14mm/6.11" * 1.18" * 0.55" Included: Package Content: 1 x Digital PH Meter 1 x User Manual