The TME thermistor handheld probes come in two types, a ball shape for ease of penetration and a straight handle for greater control. Both styles are made from polypropylene. They are totally encapsulated, increasing strength, durability and ensuring the sensor is entirely waterproof. Polyurethane cables are used as standard (as opposed to PVC) for the enhanced memory of ther curl, greater retractability and strength. These probes are ideal for use with the MM2040 Thermistor thermometer