$105.00
SE
Qiwei DDB-12H Pen Conductivity Detector measuring range 0~19.99ms/cm
0~19.99mS/cm±2% F.SConductivity Detector

$171.00
SE
Qiwei DDBJ-350 conductivity meter (portable microcomputer model) automatic temperature compensation
±1.0% F.SConductivity Detector0~199.9μs/cm;200~1999μs/cm;2.00~19.99mS/cm;20.0~199.9mS/cm

$99.00
SE
Qiwei DDB-12L pen conductivity meter measuring range 0~1999uS/cm
Conductivity Detector, temperature0~1999μS/cm±2% F.S

If you don't know how to choose "Conductivity Meter", please consult customer service.