Portable Infrared Non-Contact Thermometer – Raytek Raynyer ST61 Pro Plus Series


  • Quickly, accurately and safely measure surface temperatures of hot, hazardous, moving, or hard-to-reach objects without contact
  • Simple to use, just point and pull the trigger
  • Laser guided sighting system for easy targeting with 1% accuracy
  • Advanced optics to measure smaller targets at greater distances
  • Adjustable emissivity for more accurate temperature measurements
  • Built-in table of emissivity values for most common materials
  • Selectable MAX, MIN, DIFF and AVG functions that display values instantly with Hi/Lo Alarm
  • Display Hold and backlight with two brightness levels
  • Expanded measurement range up to 1100°F (600°C)
  • Data logging up to 20 records, including time, date, emissivity and temperature data
  • Included probe accessory for dual contact and non-contact temperature measurements

Portable Infrared Non-Contact Thermometers Raynyer ST61 Pro Plus is compact, rugged, and easy-to-use infrared with laser sighting for fast, accurate non-contact temperature measurements, also performs contact measurements with the included Type K thermocouple wire probe.


Model ST61 ST81
IR temperature range -32°C to 600°C (-25°F to 1100°F) -32°C to 760°C (-25°F to 1400°F)
Power 2-AA/LR6 batteries (alkaline or NiCd) 2-AA/LR6 Batteries or USB connection
when used with a PC
Distance: spot (90 % energy)  30:1 50:1
Communication none none
 Data storage 20 points 99 points
Operating temperature 0°C to 50°C (32°F to 122°F)
Storage temperature -20°C to 60°C (-4°F to 140°F)
Display resolution 0.1°C (0.1°F)
Spectral response 8 μm to 14 μm
Response time (95 %) < 500 ms
Accuracy < 0°C: ± (1°C + 0.1°/1°C); ≥ 0°C: ± 1 % of reading or ± 1°C, whichever is greater
< 32°F: ± (2°F + 0.1°/1°F); ≥ 32°F: ± 1 % of reading or ± 2°F, whichever is greater
Repeatability ±0.5 % of reading or ±1°C (2°F), whichever is greater
Laser sighting Single laser, output <1 mW Class II, wavelength 630 nm to 670 nm
Emissivity Digitally adjustable from 0.10 to 1.00 by 0.01 or via built-in table of common materials
Relative humidity Relative humidity 10 % to 90 % RH non-condensing up to 30°C (86°F)
Battery life 12 hours with laser and backlight on; 100 hours with laser and backlight off, at 100 % duty cycle (thermometer continuously on)


Raytek Raynyer ST61 Pro Plus Series Portable Infrared Non-Contact Thermometer-DpstarGroup