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Watlow manufacturers a broad line of thermocouples including mineral insulated metal sheathed, base metal, high temperature, surface temperature and multipoint in thermocouple types J, K, R, S, T, B and E.


Since 1914, Watlow’s SERV-RITE thermocouple wire and thermocouple extension wire have been known for premium performance and reliability. Custom and stock wires available.

Lab Services

Watlow's lab services provide prototype testing and quality certification for the development of the optimum sensor for your application. Our certification processes can verify your finished product is built to specifications set forth by the world's leading standards agencies. Product Development and Prototype Test Lab Watlow can provide testing during all phases of product development. To guarantee Watlow temperature sensors retain their quality after long-term use, we maintain a variety of custom designed furnaces and baths for long-term drift and cycle testing at temperatures up to 3090°F (1700°C). Prototype testing evaluates new sheath materials, new configurations and new manufacturing processes. Watlow is always stretching the limits and always searching for the better way to handle unique applications. We offer the following tests: Time response Vibration High temperature Cryogenic temperature Tensile and compression Humidity Life testing Cycle and drift Wire insulation abrasion Micro-hardness Dielectric breakdown Customized testing for your application ISO 10012 is used as the guide for all sensor and instrument calibration making all results traceable to the National Institute of Standards and Technology (NIST). The standard methods and specifications for sensor calibration used are: ASTM E 207 ASTM E 220 ASTM E 230 ASTM E 644 AMS 2750 Watlow can test and certify any temperature sensing product.

Resistance Temperature Detectors (RTDs)

Watlow provides resistance temperature sensors including RTDs and thermistors for electric heating applications. View our selection of temperature sensors and more.

Temperature Sensors

A wide variety of temperature sensors including thermocouples, resistance temperature detectors (RTDs) and thermistors as well as wire, mineral insulated cable, connectors and hardware are supplied by and manufactured at Watlow’s fully integrated facility.

Sensor Accessories

Sensor accessories from Watlow include fittings, thermowells, protection tubes, connectors, connection heads & blocks and transmitters.

Radio Frequency Thermocouple

Watlow's TR thermocouple probe is designed for use in plasma generation applications. It ensures accurate temperature readings through radio or conduction environments where traditional sensors are ineffective. Radio frequency energy can cause serious temperature measurement errors when exposed to these types of environments.

MICROCOIL™ Thermocouples

Based on patented technology, critical isothermal surface temperature measurement Watlow's MICROCOIL™ thermocouple provides highly accurate measurements.

Multipoint Thermocouples

Accurately measure temperature at multiple points without independent sensors. Talk to a Watlow representative today to discuss your process.

High-Temperature Thermocouples

Watlow's thermocouple offerings include noble metal and exotic metal sheaths to tolerate higher temperatures and provide greater accuracy. Click for specifications.

True Surface Thermocouple (TST)

Watlow's true surface thermocouple (TST) offers superior accuracy for measuring flat surface temperatures. This compact, highly accurate sensor isolates the thermocouple junction from ambient airflow. The TST typically achieves accuracy and repeatability between one to two percent (ΔT).

EXACTSENSE® Thermocouples

The EXACTSENSE® thermocouple from Watlow provides the accuracy, time response and durability required to help manufacturers improve the control of their diesel engine after-treatment systems. The resulting benefits include more efficient regeneration, better fuel economy and improved emissions to meet the more stringent global requirements.

Design Your Product

Use Watlow's intuitive product configuration tool to design your own product

RTD Lead Wire

Watlow's quality, experience and versatility extend from insulated thermocouple and extension wire to resistance temperature detector (RTD) lead wire and fiberglass wire. Performance capabilities include continuous temperature rating of 220 to 900°F (105 to 480°C). An optional metallic overbraid for additional abrasion resistance is available.