Specification:Product Name: Clip-on Pipe ThermometerHousing Material: Aluminum Size: Outer Diameter: 63mm Height: 10.2mm (1mm=0.0394 inch)Range: 0-120°CCech: For Connecting Outside PipesAluminum Housing0-120°C With Spring To Connect To Pipes 20-50mm63mm Hot Water Pipe Diameter Spring Thermometer For Fixing To Pipes(Can be connected to smaller or larger pipes with different spring or wire length)Mounting: Suitable for hot water, Hvac. Heating, oil tanks, etc. Note:1. We provide clear photos, measurements where possible. Check as much as you can to make sure the item is the one you need.2. Please allow 1-3mm difference due to manual measurement.3. There are no instructions in this kit. Professional installation is recommended! Package Included:1x Clip-on Tube Thermometer