Powerful Practicality---This water quality testing pen has high accuracy electrode, using alloy probe to ensure accurate measurement values, which can test the purity of drinking water to ensure it's healthy, whether filter need replaced, etc. Efficient Measurement---This water quality meter using high performance pen shaped design, and also it can read the temperature instantly, ensures that the water quality tester reads accurately. With the push of a button, the water tester can tell you your overall water purity level. Strong Function---Water quality tester with full function, can measure PH, TDS, TEMP, EC, salinity, SG, ORP, switch at will, simple and portable. All-round measurement of water quality to ensure healthy water quality, which is an ideal choice for you. Wide Application---Water quality meter is suitable for drinking water, aquaculture, swimming pool, etc, for the determination of various values of water quality. It also helps you gain a clear insight into the nutrient levels in hydroponic setups, garden soil, and so on. Convenient Use---Digital water quality tester, large screen high definition LCD display, clear values can be easily read, suitable for all walks of life testing, making readings easier and clearer. And also the data can be viewed clearly in the dark.