63mm diameter thermometer with spring for attaching to pipes. Aluminium Case. Fitment: Suitable for Hot Water, Hvac. Heating, Oil Tanks, etc. 0-120 ℃ with spring For Connecting to Pipes in 20-50mm. (you can connect to smaller or larger pipes using a different spring or length of wire) Colour: silver Material: metal Package Contents: 5 * Thermometer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.