Excellent Material:Digital water tester is made of high quality ABS material, the hydrogen measuring pen is sturdy, durable and not easily damaged. The hydrogen test pen adopts a backlit LCD design, which can read clearly in any dark environment. High Sensitivity:Drinking water tester adopting sophisticated production technology, the hydrogen measuring pen probe has high sensitivity and excellent performance. With a detachable probe design, the hydrogen measuring pen is easy to use and simple to operate. Scope of Application:Portable professional water quality tester is easy to read and record, the water hardness test tool is suitable for swimming pool experiments, hydroponic food, aquariums, gardening, laboratories, water purification drinking water, pond, hydroponics,etc. Parameters:H2 range is about 0 to 2400ppb, 0 to 2.400ppm, 2ppb, 0.002ppm resolution, 10ppb, 0.01ppm high accuracy, 0.1 to 60.0, 32.0 to 140 terature measure range,0.1/0.1 resolution,0.5 high accuracy, is a perfect water testing kits for drinking water.