DHSA28 Series High Performance Heat Spy Infrared – Discontinued

DHSA28 Series High Performance Heat Spy Infrared – Discontinued

**This item has been discontinued and replaced with the DHS40.**


The Wahl DHSA28 Series High Performance handheld infrared thermometers are advanced, easy to use models.  This model has an ultra-high temperature range of 32° to 2500°F (0° to 1380°C).  With precision ground mirrors and rare earth germanium filters, infrared energy is tightly focused on on the patented detector for accuracy of ± 0.3% of full scale (at 77°F, ±5°) and repeatability of ±3°F with 1°F / °C resolution.  This series is specialized for measurement of glass gobs, heat treating, annealing, welding, and metal ingot operations. Please note these models will not measure through glass ports.

Aluminum housing is durable and long lasting, and each model is °F/°C Switchable with adjustable emissivity.  The DHSA28 Series features an anti-reflective filter for accurate use in sunlight or strong light sources.  This model can measure normal materials, including glass surfaces.    Measurement with the DHSA28 is not affected by IR heaters, carbon dioxide, or water vapor.

Choose the best sighting option for your application:

  • Enclosed optical sight is appropriate for most applications and provides target definition at 4 feet and 20 feet with parallax correction.
  • Telescopic sight is on the centerline of the infrared optics and is appropriate for long distances (20 to 100 feet), or for precise aiming on small objects like bolts, thick cable, tubing, forgings, castings, and more.
  • Switchable laser aiming sight is a highly visible narrow red light beam used to pinpoint objects up to 100 feet away.
    • 1mW is best for indoor use.
    • 5mW is useful in bright light or outdoor conditions.

    *If measuring high temperatures, the telescopic sighting option is recommended to maintain a safe distance from the target.*

    All DHSA28 Series models feature LCD screens.

    Each unit comes with an AC adapter; choose 110V or 220V.

    The DHSA28 has a three year warranty covering defects in materials and workmanship.

    NIST Calibration Available, sold separately.

    Spec Table & High Performance Handheld Infrared Comparison

    View User Manual

Additional information

Weight 192 oz
Dimensions 13 × 6 × 15.5 in
Temperature Range

32° to 2500°F (0° to 1380°C)

Distance to Spot Ratio


Spectral Range

8 to 14 μm


Adjustable, 0.2 – 1.0

Accuracy at 77°F ±5°

± 0.3% of full scale




1°F / °C

Response time to 95% of reading

1 second

Operating Temperature

25° to 125°F (-4° to 52°C)

Temperature Coefficient

± 0.1 deg/deg

Practical Working Distance

0 to 40 feet (Telescopic sight models: 150 feet)

Sighting System

Enclosed Optical Sight, Laser Sight, 1mW, Laser Sight, 5 mW, Telescopic Sight

Output to Recorder


Power Supply

1 – 9V Alkaline Battery

Battery Life

40 hours (Laser operation will reduce battery life)


2.2 lbs (0.99 kg). Models with Telescopic Sight: 2.8 lbs (1.27 kg)

Included Accessories

User Manual, 1-9V Battery, Hard sided carrying case, Trigger Lock, AC Adapter (Specify 110V or 220V AC)

AC Adapter

110V, 220V

Screen Type


Housing Material


Temperature Scale

°F/°C Switchable


Three year warranty covers defects in materials and workmanship

CE Approval


FM Approved


Harmonized Tariff Code