Quick to install and remove, these probes won’t shake loose from a surface even in high-vibration environments. Twist their bayonet fitting into an adapter mounted on your surface to hold them in place. Their tip is exposed, so they can respond to rapid changes in surface temperatures but can’t be used in liquids. For accurate readings, move the fitting along the length of the cable until the tip of the probe is pressing firmly against the surface you’re measuring. To prevent wear, corrosion, and abrasion, an armored stainless steel cable protects the wiring that connects these probes to your temperature-monitoring device. This makes these probes a good choice for humid and harsh environments.

Pick the thermocouple type that best covers the temperature range you expect your surface 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 and thermometers.

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

Choose a probe with spade or ring terminals if you plan to connect to a terminal block. For installation, note that the red wire lead is negative.

Probes with a cord grip are easy to secure to an enclosure or conduit box. The cord grip reduces strain on the cable when it’s pulled or twisted. You can also remove it.