Two new digital multimeters (DMMs) feature built-in infrared thermometers. Models 450 and 470 have noncontact, infrared thermometers with a laser for finding hot spots, according to the manufacturer; ...

This digital thermometer circuit diagram uses a common 1N4148 diode as the temperature sensor. The temperature coefficient of the diode, -2 mV/°C is exploited for this application to create an ...