1Large led screen, with backlit function: can clearly obeserve the value in dark environment. 2Water quality reminder: smart screen will display different color due to the testing water quality value. When it is over 50ppm, it displays red color; if it is below 50ppm, it will display green color. 3Durable and long lasting: adopting laser welding solid metal keys, can be used for a long time. 4Multifunctional: can freely switch into tds value, ec conductivity, temperature. Three key: the top one key is lock key, can be used to lock the value, the medium key is function switch value for switching ambient temperature degrees celsius and fahr 5High performance imported chip: fast to deal with data speed in 3s. Premium titanium alloy probe, it shows precise detection, stable and fast value.