4 in 1 function, can be used to test pH, total dissolved solids, and TEMP of water. - Accuracy: pH: ±0.05pH/±0.1pH; TEMP: ±0.5℃; : ±2%; total dissolved solids: ±2%. - Resolution: pH: 0.01pH; : 1us/cm; total dissolved solids: 1ppm; TEMP: 0.1℃/0.1℉.
eBay