Emissivity is the measure of an object’s ability to emit infrared energy. Emitted energy indicates the temperature of the object. Emissivity can have a value from 0 (shiny mirror) to 1.0 (blackbody). Most organic, painted, or oxidized surfaces have emissivity values close to 0.95. Below thermometers have adjustable emissivity feature to ensure accuracy when measuring other materials such as shiny metals.
If you are using a thermometer with a fixed, preset emissivity of 0.95, and need to measure a shiny object you can compensate by covering the surface to be measured with spray oil, flat black paint or masking tape. Measure the temperature of the taped or painted surface. That is the true temperature.
Best Infrared Thermometers with Adjustable Emissivity:
1- Fluke 62 MAX Infrared Thermometer
Rating : 4.7 (More than 300 reviews)
Ave price : $86.52
Fluke has built this small and easy-to-use infrared thermometer with the durability and accuracy you need to do your job—all within your budget. These IR thermometers offer precise laser technology for accurate and repeatable measurements.
- Emissivity: 0.10 to 1.00
- Measures temperature from -30 to +500 degrees C (-20 to +932 degrees F) with an accuracy of + or – 1.5 degree C or + or – 1.5% of the reading from 0 to 500 degrees C
- 10:1 infrared distance-to-spot ratio with laser sighting for pinpointing the measurement area.
- Displays the minimum, the maximum, the difference between the two temperatures, and the average temperatures.
- Certified IP54 for protection against dust and splashing liquid.
- IP54 rated for dust and water resistance.
- Made from good quality materials.
- Very accurate.
- The instructions are all in drawings, no text, very difficult to understand.
2- EnnoLogic eT650D Dual Laser Infrared Thermometer
Rating : 4.7 (More than 150 reviews)
Ave price : $59.95
The ennoLogic eT650D temperature gun is is a dual laser infrared thermometer for accuracte non-contact surface temperature measurements.
- Measure surface temperatures between -58°F and 1202°F (-50°C to 650°C) with an accuracy of ± (1% of reading + 1°C/2°F) or ± 2°C/3.5°F (whichever is greater)
- Scan feature with Min, Max, and Average display
- Two built-in laser pointers to precisely identify the target spot you’re pointing at
- Large easy-to-read display with bright backlight
- Toggle between °F and °C, and turn backlight and laser on and off individually, all settings retained between uses
- Distance to Spot Ratio 10:1
- Fast power-up and response time of ~500msec
- Adjustable emissivity provides increased accuracy for different materials
- Adjustable High/Low set points with audible alarm
Easy to use and accurate.
- The battery cover is too hard to open up.
3- Etekcity Lasergrip 630 Infrared Thermometer
Rating : 4.5 (More than 200 reviews)
Ave price : $35.99
Most organic materials and painted or oxdized surface have an emssivity of 0.95. Other materials, such as polished metal surface, have a different emissivity level, which should be taken into account for accurate temperature measurement. With adjustable emissivity, this thermometer can give you a more reliable result.
- Temperature Range: -58℉ +1076℉ (-50℃ +580℃)
- Accuracy: ±2℃
- Distance Spot Ratio: 16:1
- Emissivity Adjustable: Adjustable from 0.1 to 1.0
- Response Time and Wavelength: <=500ms
- Repeatability: ±1% or±1℃
- Resolution: 0.1℃ or 0.1℉
- Useful and reasonably accurate device for measuring temperatures.
- Dual lasers are nice for knowing exactly what area is being measured.
- Small amount of people who have reviewed this product have found, it reads 4-5 degrees different than the acual temperature.