Brand：
$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
$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.