Feature: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.How to Use:1. Open the head cap, pull out the battery box and insert the battery.2. Press the power button to turn on.3. Adjust the parameters to be measured.4. Pull out the cap of the measuring end, and put the test point into the liquid for measurement according to the instructions shown in the manual.5. Please take out the battery when not in use to extend the service life.Specification:Item Type: Water Quality Test PenModel: C-600Material: ABSBattery: 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: ±0.05pHTDS: range 0-10000ppm, 10.1-200.0ppm, accuracy: 0.1ppm; 0.1ppt, resolution: ±2%F.SEC: range: 0-10000μS/cm, 10.1-19.99mS. 20.1-400.0mS/cm, accuracy: 1μS/cm; 0.1mS/cm, reso