skip to Main Content

The 381a is a non-contact and contact temperature tester with laser sighting to confirm your target.

381a Combination Non-Contact/Contact Thermometer
381a Combination Non-Contact/Contact Thermometer

The 381a uses K-type thermocouples with sub-mini connector for contact measurements.

  • Contact and non-contact thermometer
  • Maintain reading on display
  • Laser sighting
  • Backlit display
  • 9:1 distance to spot ratio
  • 0.1 degree resolution
  • 095 emissivity
  • 3 Year Limited Warranty

$74.95 USA Suggested List Price

Tequipment.net
Digi-Key Electronics
TOTALINE
Where to Buy TPI Products

Frequently Asked Questions

  1. What does “distance to spot ratio” mean?
    The laser spot needs to be showing inside the target area. An 8:1 “distance to spot ratio” means you are measuring a 1” diameter area at a distance of 8”.
  2. How far can I measure?
    Distance is unlimited. The size of the target area sets the limit on distance for accurate measurements. Example: If the area you wish to measure is 1 foot in diameter, then you will need to be within 8 feet to record an accurate temperature.
  3. What is the smallest target I can read?
    Approximately one-half inch in diameter.
  4. What is emmisivity?
    This is a ratio of an object’s infrared emission compared to a theoretical black body considered 1. Emissivity is always less than 1. Adjustable emissivity allows your non-contact thermometer to be adjusted to the surface you are checking to make readings more accurate.

SEALS3

 Model 381a Specifications
 Temperature Range  Non-contact: -4° to 572°F (-20° to 300°C)
 Contact:* -148° to 2192°F (-100° to 1200°C)
 
 IR Accuracy @ 23°C and 0.95 emissivity  ± 5°F (3°C) below 32°F (0°C)
 32°F to 572°F (0°C to 300°C) ± 2% of rdg
 or ± 3.5°F (2°C) whichever is greater
 
 Contact Accuracy  +(0.5% of reading + 3.5°F (2°C)
 Distance to Spot Ratio  9:1
 Response Time  500mS
 Spectral Response  7 to 14um
 Emissivity  0.95 Fixed
 Laser Sighting  Output <1mW, Wavelength 645-660nm, Class II Laser
 °F or °C  Selectable (slide switch in handle)
 Contact or Non-contact  Selectable (slide switch in handle)
 Display Hold  Yes
 Operating Temperature  32°F to 120°F (0°C to 50°C)
 Battery Type  9V

* Depends upon temperature probe range

381a Applications

  • Ideal for under-floor heating
  • Check for cold spots on radiators
  • Read temperatures in Hard to Reach Areas

Distance to Spot Ratios (D:S) for TPI IR (Non-contact) Thermometers:

Models 375 / 376 / 377 (11.5:1):

375,376,377

 

 

 

 

 

 

Models 380 / 381 / 383 / 384 (9:1):

380,381,383,384

TPI 381 Demonstration Video

Product Documentationpdf-icon1

Click below to view or download product documentation PDFs:

381a Manual

381a Data Sheet

Back To Top