TDS METER CD301: 1990ppm/10ppmTDS METER CD302: 10000ppm/100ppm
ORP METER 1061A: 0 to ±999mVPOCKET PH METER PH-107: 0.0-14.0PH
POCKET PH METER PH-108: 0.0-14.0PH
TDS /ORP /PH METER