United Electric 54 Temperature Switch - 1 SPDT Switch Output. Adjustable Setpoint Range: 150° to 650°F. Max Temp: 700°F, Scale Div: 25°. Bulb (OD x Length): 3/8" x 3-5/8". 304 Stainless Steel Bulb and 6-Foot Capillary, Internal Adjustment with Reference Dial. NEMA 1 Black-Finished Lexan Enclosure.