Clip On Pipe Thermometer | 7/8" to 1-5/8", 22.2 to 41.3mm
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
Mainstays Candy Thermometer, Clip Attachment with Easy to Read Red and Black Numbers bold display - Walmart.com