Clip-on and pocket thermometers are intended to check temperatures on the spot. Pocket thermometers can be carried in pockets. Clip-on thermometers have a vat or pan clip for temporary positioning to constantly monitor an open vessel. Dial and digital pocket thermometers used in testing lab, HVAC, and other applications. Dial and digital pocket thermometers are often used for recording temperatures in testing, laboratory, and HVAC applications. NSF-rated thermometers check and monitor temperatures in food processing environments.