How to measure the surface temperature of the stainless steel pipe?

Stainless steel pipe is a hollow long round steel, the main is widely used in petroleum, chemical, medical, food, light industry, machinery, instrument, such as industrial pipeline and mechanical structure parts, etc. Because some stainless steel tube is fine, so how to measure the surface temperature of the stainless steel pipe? We can use the single spring surface thermometer, hoop on the stainless steel pipe, after waiting for stable readings can be reading. Single spring on the surface of the concrete parameters of the thermometer below: models: ST221SS - Two types: pipe thermometer, surface thermometer structure: axial type, spring type fixed ring on the cover: pressure BianShi material: stainless steel shell, the copper connection tooth head: no teeth, behind a word adjustable surface diameter: 63 mm temperature range: 0 - 120C( Can be customized) Accuracy: & plusmn; Note: 3% table: glass this single spring thermometer can be fixed line within 50 mm.