Send temperature readings to two separate devices—these probes, also known as duplex thermocouples, have two thermocouples inside. For example, one thermocouple might connect to a device that logs data while the other connects to a device that automates processes based on temperature. Made of stainless steel, these probes resist corroding from liquids and gases. The stainless steel also shields the sensor from impact, so you can use them with solids, such as molds and dies. If space is tight, bend them up to 90°. They have a protective layer of magnesium oxide to keep the wiring from kinking when they’re bent.

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 devices you plan to connect it to.

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

Note: When installing probes with wire leads, the red wire is negative.