The Milwaukee 4 Ring MA814DB/1 is the replacement EC/TDS/Temp Probe for MW170 & MW180 Bench EC/TDS/Temp meters.  The MA814DB/1 has a rugged body designed to take hits and comes with a 1 meter (3') cable and a DIN connector (meter(s) sold separately).

The probe connects quickly and tightly with a screw on DIN. No worries of slipping off.