PK-02A Flate-Leaf Surface Probe of the K Type Temperature Thermocouples with a measurement range of -50°C to 300 °C. They have a thickness of 1.0mm and width 2.0mm. The length of flat leaf in golden color is 84mm. The length of the straight cable is 930mm. TPK-02B Wider Flate-Leaf Surface Probe of the K Type Temperature Thermocouples have a measurement range of -50°C to 300°C. Noted for its 1.0mm thickness and width 5.0mm. The length of flat leaf in golden color is 84mm. The straight cable length is 930mm.