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 Thermometers Analog Anlegethermometer Galvanized Steel Thermometer | eBay
Series STC | Pipe-Mount Bimetal Surface Thermometer measures a pipe surface temperature. Available in 3 different clip sizes. Applications in HVAC and non-intrusive temperature measurement. | Dwyer Instruments