... , 307W and 12DW meters for the measurement of conductivity in liquids The DDS-W Series includes models 11AW ... , 307W and 12DW meters for the measurement of conductivity in liquids.Features: Push-button calibration, 1 point ... for best accuracy under fluctuating temperaturesModelDDS-11AWDDS-307WDDS-12DW Conductivity Range0~1.999, 19.99, 199.9, 1999uS ... ×65(H)mm Weight1.7kg DDS-307W CONDUCTIVITY METER