The Milwaukee MA852D/1 Pre-Amplified replacement pH/EC/TDS/Temp Probe for MW805 & MW806 portable pH/EC/TDS/Temp meters. The MA852D/1 has a rugged body (ABS) designed to take knocks and comes with a 1 meter (3') cable, DIN connector and can withstand up to 1 bar of pressure (meter(s) sold separately).
The probe connects quickly and tightly by a screw on DIN with no worries of slipping off.