For all your test equipment requirements

Reed ST-8839 Infrared Thermometer

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  • User selectable °F or °C
  • Built-in laser pointer identifies target area
  • 50:1 distance to spot ratio measures smaller surface areas at a greater distance
  • Digitally adjustable emissivity from 0.10 to 1.0
  • High and low alarm setpoints
  • Max, Min and Dif. Avg. temperature displays
  • Large LCD with backlight and display hold

Authorised Australian Distributor

1 Year Warranty

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SKU: Reed ST-8839 Category: Tags: ,

REED ST-8839 Specifications

Temperature Range -58.0 to 1832°F (-50.0 to 1000°C)
Resolution 0.1 up to 200°; 1° over 200°
Accuracy -50 to -20°C (-58 to -4°F): ±5°C (±9°F);

-20 to 200°C (-4 to 392°F): ±1.5% of reading ±2°C (±3.6°F);

200 to 538°C (302 to 100°F): ±2.0% of reading ±2°C (±3.6°F);

538 to 1000°C (1000 to 1832°F): ±3.5% of reading ±5°C (±9°F);

Optical Resolution 50:1
Emissivity Adjustable from 0.10 to 1.0
Response Time Less than 1 second
Power Supply 1 x 9V alkaline battery
Dimensions 9 x 3.9 x 2.2″ (230 x 100 x 56mm)
Weight 10.2 oz (290g)

REED ST-8839 Distance & Spot Size

Distance to Spot


As the distance (D) from the object increases, the spot size (S) of the area measured by the unit becomes larger. The relationship between distance and spot size for each unit is listed below. The focal point for each unit is 914mm (36”). The spot sizes indicate 90% encircled energy

Operating Instructions 1. Hold the meter by its handle grip and point it toward the surface to be measured 2. Pull and hold the trigger to turn the meter on and begin testing. The display will light if the battery is good. Replace the battery if the display does not light 3. While measuring, the SCAN display icon will appear in the upper left corner of the LCD 4. Release the trigger and the HOLD icon will appear on the LCD indicating that the reading is being held 5. The meter will automatically power off approximately 7 seconds after the trigger is released. Unless the unit is locked on.


Food preparation, safety and fire inspectors, plastic molding, asphalt, marine and screen printing, measure ink and dryer temperature, HVAC/R, diesel, fleet maintenance and much more


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