GAOTek Infrared Thermometer with Wide Measurement Range (Accurate)

This ‘Infrared Thermometer with wide measurement range (Accurate)’ is a non-contact temperature tester for a temperature range from -14° F to 931 °F (-10 °C to 499.5 °C) and with distance spot ratio 35:1




GAOTek ‘Infrared Thermometer with wide measurement range (Accurate)’ is a non-contact temperature tester for a temperature range -14°F to 931°F (-10°C to 499.5°C) and a with DS ratio 35:1. Within less than a second, the reading of the surface temperature of any object that is too hot, too dangerous or too difficult to contact can be safely measured without the need of physical contact. This has extensive usage in food, security inspection, train, diesel engine and injection moulding applications

Key Features

  • Non-contact device with accurate temperature measurement
  • Works with a temperature range -14°F to 931°F (-10°C to 499.5°C)
  • Built-in laser aiming
  • White backlight (liquid crystal display)
  • Distance spot ratio D:S=30:1
  • Selection mode: ℃/ ℉  optional
  • Auto-data hold and auto-turn off (Auto turn off after 15 s when release the button)

Technical Specifications

Display White backlight LCD
Spectral Response 3 um to 14 um
Emmisivity 0.99/0.95/0.89/0.85/0.79/0.75
Temperature Range -14°F to 931°F (-10°C to 499.5°C)
932°F to 2642°F ( 500°C to 1450°C)
Ambient Operation Range 32°F to 104°F (0 to 40°C)
Relative Humidity 10 % RH to 80% RH
Resolution 1 °C/°F
Response Time 0.5 sec
DS 35:1
Battery 9V battery
Measurement precision 13 °F to 2,640 °F  (-25 °C to 1,450 °C)

±(1.5% +1 °C)
±(1.5 % +1 °F)

Additional Specifications:

Panel Description

A: Infrared sensor

B: Laser sight

C: Liquid crystal display

D: Backlight selection button

E: Emissivity selection button

F: MAX, MIN and AVG selection button

G: Scan trigger

H: On /off switch button

I: laser selection switch


  1. Scan mode symbol
  2. Low voltage symbol
  3. Backlight symbol
  4. Laser on symbol
  5. Emissivity (6 options)
  6. °C /°F symbol
  7. Data storage symbol
  8. MAX symbol
  9. MIN symbol
  10. AVG symbol

 Field of View

How it works

Infrared thermometers measure the surface temperature of an object. An optical component of the unit collects energy emitted reflected and transmitted and focuses it onto a detector. Then an electronic component translates the information into a temperature reading which is displayed on the unit. The laser is used for aiming purpose only.

Operating Instructions:

  1. Install a 9 V battery and pull the “Scan Trigger” to turn the power on. If the backlight is needed but it’s not on, press the “Backlight Button” (Button L) at the bottom right corner to turn on the backlight. Press the button again to turn it off.
  2. To provide the user with more options, this unit offers 6 emissivity modes, including 0.99, 0.95, 0.89, 0.85, 0.79 and 0.75. Press the “Emissivity Selection” Button (Button in the middle of the panel) to select the mode sequentially. Each press results in a change in the emissivity mode. As different objects have different emissivities, it is necessary to select the right emissivity setup to ensure accurate measurement.
  3. To use °C /°F switch mode, open the cover of the battery holder and use the built-in switch (which is at the upper part of the battery holder and visible as soon as the cover is removed) to select the mode needed; to activate the laser aiming function, open the cover of the battery holder and use the built-in switch to select the function needed (the laser is used for aiming purpose only).
  4. To measure a temperature, point the unit at an object and pull the Scan Trigger. (Be sure to consider distance-to-spot ration and field of view.) The temperature reading will appear on the display. When the trigger is released, the unit will automatically store the last temperature reading and turn off in about 15 seconds. Pressing the Scan Trigger again will restart the scanning process.
  5. The unit provides MAX, MIN and AVG reading display functions. Press the button at the left of the panel (Button M) to get the maximum, minimum and average readings measured.

How to accurately measure the temperatures

  1. The unit gets temperature compensation automatically from the ambient temperature. After measuring a high-temperature object, the unit needs at least 15 minutes to adapt to the ambient temperature of the next object to be measured. In addition, it needs a few minutes of preparation after measuring a low-temperature object and before measuring a high-temperature object too.
  2. Locating a hot or cold spot: To find a hot or cold spot, aim the thermometer at the area of interest. Then slowly scan across the area with up and down motions until you locate the hot or cold spot.
  3. Field of view: Make sure that the target is larger than the unit’s spot size. The smaller the target, the closer you should be to it. In cases where accuracy is of particular importance, make sure that the target is at least twice as large as the spot size. When the laser aiming function is activated, the laser spot indicates the area to be measured.
  4. How to use the AVG function: scan a number of spots in the measurement area of the object; press the button at the left (Button M) and select AVG. The reading obtained is the average value of the measurement, which is closer to the real temperature of the object.

Applications of the Infrared thermometer

General Fields of application includes electricity, petrochemicals, metallurgy, automobiles, electronics, tobacco, pharmaceuticals, hotels, machinery, plastics and moulds. Notably, it could be used in the following fields:

  1. Industrial electronics: to measure the loose/hot spots of electronic panels, fuse units, engines /gearboxes, bearings/bearing boxes, power distribution cabinets and electronic components.
  2. Heating or cooling systems: to examine or monitor the status of gas supply, air conditioning or ventilation pipe systems.
  3. Automobiles: to examine the status of motors, cylinder heads, heating/cooling systems, or to scan the temperatures of jammed radiators, power trains, or bearings/bearing shells, etc.
  4. Food safety: to monitor or control food temperature in acceptance, storage, transportation and production processes, for example in supermarkets (cold storage), hotels and kitchens.


The emissivities of most organic materials and painted/oxidized surfaces are 0.95. Use of the product on bright or polished surfaces will lead to inaccurate readings.

Object Emissivity Object Emissivity
Bitumen 0.90~0.98 Clothing (black) 0.98
Concrete 0.94 Human skin 0.98
Cement 0.96 Soap bubble 0.75~0.80
Sand 0.90 Charcoal 0.96
Soil 0.92~0.96 Paint 0.80~0.95
Water 0.92~0.96 Textile 0.90
Ice 0.96~0.98 Rubber (black) 0.94
Snow 0.83 Plastics 0.85~0.95
Glass 0.90~0.95 Wood 0.90
China 0.90~0.94 Paper 0.70~0.94
Marble 0.94 Chromium oxide 0.81
Gesso 0.80~0.90 Copper oxide 0.78
Mortar 0.89~0.91 Iron oxide 0.78~0.82
Brick 0.93~0.96