Extech 341350A-P Oyster Series pH/Conductivity/TDS/ORP/Salinity Meter Oyster meter with mini pH electrode and Polymer conductivity cell Large LCD built into adjustable "flip-up" cover displays measurement and temperature simultaneously Microprocessor based with splash proof housing and front panel tactile touch pad to slope and calibrate Rugged design for handheld or benchtop use; neck strap for "hands-free" operation Memory function stores and recalls 25 labeled readings