Features 1、Designed with large and clear backlit LCD screen, it is easy to read, and the test function is accurate. 2、The simple operation panel and easy-to-read display make the instrument easy to understand and operate. 3、It is economical and practical and fully meets the testing needs of various industries. 4、Suitable for aquarium, aquaculture, soilless culture, swimming pool and hot spring, school laboratory, etc. 5、The water quality tester with high stability and better performance has accurate test results. Specification Item Type: Water Quality Test Pen Model: C-600 Material: ABS Battery: 3 x 1.5V LR44 (battery not included) Uses: Aquariums, aquaculture, soilless culture, swimming pools and hot springs, school laboratories, chemical, food or beverage manufacturing, textile printing and dyeing, paper or pulp bleaching, printing, cooling towers, boilers, cleaning or sewage treatment, etc. PH: range: 0.00-14.00, accuracy: 0.01pH, resolution: ±0.05pH TDS: range 0-10000ppm, 10.1-200.0ppm, accuracy: 0.1ppm; 0.1ppt, resolution: ±2%F.S EC: range: 0-10000μS/cm, 10.1-19.99mS. 20.1-400.0mS/cm, accuracy: 1μS/cm; 0.1mS/cm, resolution: ±2%F.S Salinity: range: 0.01%-25.00% 0-10000ppm, 10.1-200.0ppt, accuracy: 1ppm; 0.1ppt; 0.01%, resolution: 0.01%-5.00% (±0.1%) 5.1%-25% (±1 )±2%FS ORP: range: ±999mV, accuracy: 1mV, resolution: ±2mV S.G: 1.000-1.222 Temperature: ATC: 0-60℃ Package List 1 x Water Quality Test Pen (Battery Not Included) 3 x PH Powder 1 x Manual