Compact Infrared Thermometer

Typical Error of Reading

A typical error of reading is not a simple figure, it's a function of Tobj (object temperature) & Tamb (ambient temperature)
Because Infrared Thermometer is a "Relative" measurement instrument. (It compares the Tobj against Tamb)
So, the error has a minimum value when Tobj ~ Tamb,
that is when you measure something close to ambient temperature.
For ZyTemp, this minimum value (dTabs) = 0.15°C / 0.27°F ,
usually, our competitor is larger than 0.2°C / 0.36°F
At higher or lower temperature, there is a Gain Error, usually 2%.
Q: Since the spec is "+/-2°C or 2%", is IRT most accurate at Tobj=0°C?
A: No, as described as above, IRT use a "Relative" measurement, IRT is most accurate at Tobj=Tamb,
In other words, when you point the IRT at a "near room temp" object, it will be very accurate.

Q: Can I calibrate my IRT by pointing it to a wall (25°C)?
A: No, even though the Gain run away, the IRT still shows 25°C, you have to use a "Temperature Different From Tamb",
(ex. 0°C or 50°C)  0°C is the most available temperature "standard", for ordinary user.