Clip on Pipe Clamp HVAC Thermometer - Clip on Thermometer Pipe Temperature Gauge for Measuring Temperatures of HVAC Hot Water Pipes and Radiators: Amazon.com: Industrial & Scientific
Pipe/Surface Thermometer Spring Mounted | Instruments to Industry
Dial Pipe Thermometer | Ideal for HVAC industry | ETI 800-951
Clip on Cold Water Pipe Thermometer - Brannan
Brannan 66mm Dial Clip on Pipe Thermometer 0/120C&| at Zoro