The sensors use fast-response thermistors in a plastic over-molded copper-clip that snaps onto 3/8-in. return bends. Available in 5- and 10-k models, the unit comes with a 10-ft. AWG#22 jacketed cable.

Spectrum Sensors & Controls Inc., 424 Crown Point Circle, Grass Valley, CA 95945, (800) 880-7730, specsensors.com