4 IN 1 MULTIFUNCTIONAL PH METER: The PH meter is a combination of TDS / EC / PH / TEMP tester functional in one, The measuring range is pH 0.00-14.00 (0.05 PH accuracy), TDS 0-10000 ppm, 10.1-200.00 ppt, EC 0-10000 uS/cm, 10.1-19.99 mS. 20.1-400.0 mS/cm and temperature 0-60, (RH 100%). High performance, pen shape design, fast numerical stability and accurate calculation result. AUTOMATIC CALIBRATION & ATC: With automatic identification, three-point calibration, equipped with a calibration powder pack to allow to use common conductivity buffer solution to calibrate and automatically recognized when in calibration mode and read the digital in a snap. Easy to operate and less error. At the same time, its ATC function can decrease the error caused by the change of liquid temperature, improving accuracy rates. LED BACKLIGHT & PORTABLE: LED backlihgt design, intuitive information, easy to read, clear display and readability of data even in dark conditions. Pocket and handheld size, lightweight, easy to take to anywhere. Equips 5min auto-off function, save power and extend battery life. Detachable probe design, prevents accidental damage to the probe and increases the cost of replacement, easily replacing the probe, more convenience. WATERPROOF & DURABLE: The tds meter digital water tester with IP67 international high waterproof and dustproof. Can protected against dust penetration and short-term immersio. It still can work normally even if fallen into water. It is made of low-resistance glass sensitive film and rpremium titanium alloy, high sensitivity, more accurate measurement results, more corrosion resistance. WIDELY APPLICATION: The water tester can test the quality of drinking water, pool, aquarium, RO system, SPA, aquaculture or hydroponics, very suitable for water plant laboratories, aquaculture and domestic use, it is ideal for home and laboratory PH testing applications, ensure water safety in daily life.