Digital 8-in-1 PH TDS TEMP ORP EC Salinity H2 Water Quality Tester
Salinity: 0–20%. ORP: ±1999 mV. TDS: 0–100,000 ppm. EC: 0–200,000 µS/cm. Monitor your water quality easily with this all-in-one digital tester pen. Ideal for pools, aquariums, and general water testing.