Dwyer TSF-4021-MDF is a Thermocouple Limit Control ideal for monitoring and maintaining temperature within a range of 32 to 150°F (0 to 65°C) for ambient conditions, and -4 to 176°F (-20 to 80°C) for storage. It offers ±1% FS accuracy, a 3-digit red display, SPDT relay output rated 16 A @ 240 VAC resistive, and a power consumption of 4 VA. It operates on 115 VAC, 230 VAC, 12 VAC/VDC, or 24 VAC/VDC power supply depending on the model. The control type is ON/OFF with manual/automatic reset, and it has a front panel rating of IP64 (NEMA 3R). Compatible with Type J, K, or S thermocouples, it has a probe range of 32 to 999°F (0 to 700°C) for Type J thermocouples and 32 to 999°F (0 to 999°C) for Type K or S thermocouples. The memory is nonvolatile, and it boasts a 1 HP horsepower rating.