7 in 1 PH/ORP/EC/TEMP/SALT/S.G/TDS LCD Water Quality Tester Meter Pen Detector
ORP negative potential ±1999MV. Salinity 0-20%. The specific gravity of S.G seawater is 1.000-1.222. 2, TDS value 0-200000ppm. H2 hydrogen rich 0-2400PPb. EC value 0-200000㎲/cm. 1x 7 In 1 Tester Pen. PH value 0-14.