Safe to use while measuring temperatures near flammable gases or combustible dust, these probes have an explosion-proof head that’s FM approved. They are stainless steel to resist corroding when immersed in liquids and gases. They can also be used with solids, such as molds and dies, because the stainless steel acts as a shield if they’re hit or bumped. Rated NEMA 4, these probes seal out dust and water from washdowns. A layer of magnesium oxide protects the wiring inside. To adjust the length of the probe for your application, slide the fitting up towards the probe head or down towards the tip. Once it’s in the right spot, tighten the fitting to compress it against the probe, securing it in place.

Pick the thermocouple type that best covers the temperature range you expect your liquid, gas, or solid to be. You should also make sure the thermocouple type you choose is compatible with the device you plan to connect it to. These probes are often used with temperature controllers, thermometers, and other temperature-reading devices. Remove the cap on the head to wire them to your device.

These thermocouples are manufactured to conform to ASTM E230 for accuracy. Accuracy is how far off the reported value is from the actual temperature.