Low Cost Handheld Infrared Thermometer Temperature Range -32°C to 535°C

Temperature Range -32°C to 535°C
Temperature Range -32°C to 535°C

This range of low cost, handheld infrared thermometers has laser sighting and large backlit LCD displays.

Each unit measures from -32°C to 535°C with 0.1°C resolution.  They also offer a superior 12:1 field of view, which helps to minimise errors by producing a small diameter measurement area.

The emissivity setting on this thermometer is fixed at 0.95, making it ideal for most organic materials and non-shine (painted, corroded or anodised) metals.  The emissivity setting on the thermometer is adjustable from 0.1 to 1.0 and can be set automatically by using the thermocouple input and eSmart feature.

Both models provide adjustable audible and visual alarms in which the colour of the display changes when the target temperature exceeds the alarm set point.

Readings can be taken in °C or °F, and when the trigger is released the last measurement is held for approximately 7 seconds before the unit automatically turns off.

The thermometers will operate in ambient temperatures from 0°C to 50°C and are powered by a standard PP3, 9V battery.  Each unit is supplied complete with a soft carrying case.


Infrared Thermometer Features

  • Wide temperature range
  • Built-in laser pointer to improve aim
  • Narrow field of view
  • Input for type K thermocouple (Part no. 25-ST642)
  • Adjustable emissivity (Part no. 25-ST642)
  • Adjustable high and low alarms, audible and visual
  • Backlit display with Data Hold
  • °C / °F switchable
  • Fast sampling time
  • Auto-hold and power off
  • High quality construction


General Specifications
Field-of-view 12:1
Temperature Range -32°C to 535°C (-25°F to 999°F)
Accuracy* ±3°C (±5°F) from -32°C to -20°C (-25°F to -4°F)
±2°C (±3°F) from -20°C to 100°C (-4°F to 212°F)
±2% above 100°C (212°F)
Spectral Range 5 to 14µm
Repeatability ±1°C (±2°F)
Resolution 0.1°C (0.1°F)
Response Time 500ms
Ambient Range 0°C to 50°C (32°F to 122°F), 10% to 90% RH
Power OFF  Automatic after approx. 7s
Display LCD with backlighting
Battery Type 9V, PP3
Dimensions 180mm x 130mm x 40mm
Weight 195g

* Accuracy is given at ambient temperature of 25°C (77°F)

     25-ST640      25-ST642
Emissivity      Fixed at 0.95      Adjustable 0.1 to 1.0
Type K Thermocouple Input      NO      YES
eSmart Emissivity Correction      NO      YES
Audible Alarm      YES      YES
CIS Visual Alarm      YES      YES
°C/°F Switchable      YES      YES
Backlight      YES      YES
Laser Sight Switchable      YES      YES
Max/Min/Avg/∆T      YES      YES
Carrying Case      YES      YES



Order Code                Description
25-ST640            -32 to 535°C, resolution 0.1, fixed emissivity 0.95
25-ST642            -32 to 535°C, resolution 0.1, adjustable emissivity 0.1 to 1.00,
          type K thermocouple input