In 1 Multi-function pH Meter - This pH meter is designed with 7 in 1 functions. You can switch to measuring TDS (total dissolved solids), EC (conductivity), salinity, temperature, ORP (oxidation-reduction potential), specific gravity and pH by simply pressing the {Mode/Calibration} key; Wide Application - The 7 in 1 digital pH tester is suitable for testing home drinking water, hydroponic systems, swimming pools, aquariums, laboratories, etc. The salinity tester can not only be used to detect the salt content of edible salt, saltwater pools and koi ponds, but also can be used to detect the salinity of seawater, oceans and saltwater pools; LCD display, easy operation - It is easy to operate, even beginners can use it with confidence. This digital water quality meter uses chips and electrodes with high-precision algorithms to ensure fast and accurate response. Once the reading is stable, just press and hold the HOLD/TEMP button to lock the reading and take it out for viewing. The LCD screen clearly displays the value and the corresponding physical quantity unit, and has a 5-minute automatic shutdown function to save power; IP67 waterproof and dustproof - It can prevent short-term immersion and dust (it can still be used even if it falls into the aquarium). But please note that the glass ball at the tip of the pH pen is fragile, please use it with care or dry it; Contents - 7 in 1 water pH meter, user manual, 4 packs of pH buffer powder. Each product has been tested before shipment, there may be slight test marks, but they are all brand new products;