- ST640
+ Low-cost, temperature gun-style infrared thermometer
+ Temperature range: -35°C to 550°C
+ Laser sighting with on/off switch
+ Fixed emissivity 0.95, ideal for use on rubber, wood, asphalt, plastics, painted surfaces, organic materials and many more
+ Backlit display
+ Audible alarms
- ST642
+ All the features of the ST640, plus:
+ Adjustable emissivity setting for accurate readings on a variety of surfaces
+ Type K thermocouple input
+ Automatic emissivity adjustment using the thermocouple measurement