Thermo Scientific TDSTestr 11+ is an advanced waterproof multi-range compact TDS meter that offers improved resolution, extended ranges, auto-ranging, 1% accuracy, ATC, multi-point calibration, temperature display, selectable TDS factor, data-hold, auto-power off, self-diagnostic messages, and user-replaceable cup type sensor module. Cup sensor design allows dip-into or scoop-up low-volume sample measurements.