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Agrowtek Oxidation Reduction Potential (ORP) Probe Choose Your Sensor:Temperature Probe if you decided to startHigh quality sensor probes manufactured in the U. S. A. for Agrowtek's SXH, GXH, PHX sensor transmitters, and MDX, MPX, & GDX dosing systems. Agrowtek Sensors & Probes Temperature Probe 20 to 60C 3 ft Tinned Lead Connection Made in USA Stainless steel probe, 1 4" diameter x 3" with 3ft lead pH Probe 0 14 pH 3 ft BNC Connection Made in USA High quality pH sensor probe Conductivity (EC) Probe 0 5000 uS 3 ft Tinned Lead Connection Made in USA High