Sensors,5 Level Sensor Pcl/Pch 179528, Electrical Connection Type Hardwired, Display Type Not Applicable, Display Units Not Applicable, Display Resolution Not Applicable, Overall Length 4 in, Overall Height 4 in, Maximum Operating Temperature 406 Degrees F, Features Remote Sensors, which Thread into the Top of the Boiler or Tank, are Available with 1, 2, 3, 4 or 5 Probes of Varying Lengths that can Easily be cut to Desired Set Points, For Use With Boilers, Hydronic Systems, Tanks