Suitable for temperature measuring in solid, liquid and gaseous media, these relays monitor temperatures for exceedance and shortfall or within a specific operating range (window function). The devices also present a good alternative to temperature controllers in the low-end range. Siemens Temperature Monitoring Relay, Adjustable, 50/60 Hz, 24 VAC/VDC Coil, Spring Terminal, 3-Digit LED, -99 to 1830 °F, 45 mm W x 91 mm D x 106 mm H