Ap-2 aquapro water quality electrical conductivity tester, 0-9999 µs range, 1 µs resolution, +/- 2% readout accuracy, measures electrical conductivity (ec).., by hm digital

Measures electrical conductivity (ec) and temperature. automatic temperature compensation (atc) water-resistant housing digital calibration (push button) auto-off function, data-hold function and low-battery indicator.