$130.00
SE
KeDiDa CT-6322 pH & Conductivity Detector Pen Range: 0.0~14.0PH/0.0~199.9US
pH:0.0 to 14.0pH;电导: 0.0 to 1999 uS/cm

$133.00
SE
Kodida CT-8022 ORP meter Oxidation-reducton potential metering range: ± 1200mV
±1200mV

$127.00
SE
KeDiDa CT-6321 pH meter/Conductivity Detector Range: 0.0~14.0PH/0.0~199.9US
pH:0.0 to 14.0pH;电导: 0.0 to 199.9uS/cm

If you don't know how to choose "STIP-scan", please consult customer service.