1、[Large Range] TDS meter with 0 to 9990PPM range for wider use (X10 is displayed in the upper right corner of the screen when greater than 999). Suitable for domestic water, swimming pool, aquaculture, etc. 2、[Sensitive And Accurate] This TDS water tester uses a titanium alloy probe for greater sensitivity and more accurate testing. Mini size, easy to carry around, test the purity of water anywhere, anytime. 3、[Intelligent] Digital TDS meter supports one key lock, after the value is stable, press HOLD to lock the value. In the absence of any operation, 5 minutes automatic shutdown, extend the battery life. 4、[Professional And Practical] TDS is the total dissolved solids, the higher the TDS value, the more impurities contained in the water. Easy to measure water quality, drink healthier water. 5、[Easy To Operate] TDS test pen with simple button operation, 3 seconds quick test, fast and accurate. Power on and use, after tens of thousands of tests, durable. With clear display, easy to read data.