Apera Instruments AI213 Value Series TDS20 Waterproof TDS Pocket Tester kit, Accuracy: ±1% F.S, 2-Point Auto. Calibration

Proprietary conductivity sensor technology The platinum black sensor is built with Apera's special processing technology, which minimizes electrode polarization, expands measuring range, and increases the firmness of the electrode, hence ensuring a significantly higher accuracy (±1% of full scale) in a wide-range conductivity measurement (0 to 10ppt or 10,000 ppm) than traditional stainless steel electrodes, and takes minimal maintenance.

Unit conversion: 1 ppt =1000 ppm The unit automatically changes to ppt when the reading is greater than 1999ppm.