The first is the difference in measurement range. Optical pyrometers measure high temperatures from 700°C to 3200°C. Infrared thermometers have a wider temperature measurement range, ranging from low temperatures of minus tens of degrees to high temperatures of 3000 degrees, which can be said to be more extensive.

They also have obvious differences in readings, optical pyrometers are based on pointer readings on the dial, LED display, while infrared thermometers are displayed by LED, the thermometer is automatically stored or read through computer software.
Aiming is different. Optical pyrometers are aimed through eyepiece observation, while infrared pyrometers can use laser target light and video modules in addition to visual viewfinders. In the measurement band, the optical pyrometer is around 0.66um, while the infrared thermometer is 0.7~14um.
The measurement accuracy of optical pyrometers is ±1%, laboratory pyrometers can reach ±0.05%, and infrared thermometers can reach up to 0.1%.
In terms of working mode, after the mechanical installation is completed, it can automatically measure and read (online) or hold the thermometer at the target and press the button to read.
The optical pyrometer changes the height of the filament by observing and adjusting the current flowing through the filament until it is the same brightness as the background light, and the reading error is large.
Infrared thermometers are used in high-traffic and dense areas, such as schools, shopping malls, banks, stock exchanges, cinemas, markets and other public places; the screening-type temperature measurement method is used to quickly screen fever personnel and avoid manual Crowding and gathering of people caused by screening.