Use this probe for monitoring cold storage or ambient room temperatures. The 10K thermistor probe built with a 20′ wire is also easy to splice and extend, and additional lengths of 100s of feet can be added without any impact to temperature accuracy. Probe type: 10K Thermistor. Probe Temperature Range: -58 to 248°F (-50 to 120°C). Specifications: 20 ft. cord, 2.5mm audio connector, 1 in. long probe, 4mm. diameter.