SMOBOT comes with 2 food probes to monitor your food. This replacement probe is good to have onhand in case you misplace one or damage one. Choose Black or Blue to help you identify Food Probe 1 or 2 instead of tracing wires. These new shorter, thinner probes are 6inch (15cm) long overall and 0.12inch (3mm) in diameter. Probes are water resistant and heat proof up to ~500F (260C).