# FAQ: What Does The Ratio On An Infrared Gun Mean?

Optical resolution is defined by the ratio of the distance from the instrument to the object compared to the size of the spot being measured. This is called the Distance to Spot (D:S) ratio. The larger the ratio number, the better the instrument’s resolution and the smaller the spot size that can be measured.

## What does the ratio mean on infrared thermometer?

Every infrared thermometer has a ” distance-to-spot ” (D:S) ratio that tells you the diameter of the area being measured compared to the distance from the target.

## Is infrared thermometer accurate?

Research has shown that, when used correctly, infrared or no-contact thermometers are just as accurate as oral or rectal thermometers. No-contact thermometers are popular among pediatricians, as kids often squirm around when trying to get a temperature read, but it also holds true in mass temperature screenings.

## What is normal forehead temperature with infrared thermometer?

It would be normal to read an actual forehead skin surface temperature between 91F and 94F if using a general-purpose infrared thermometer. Some infrared thermometers have an “adjustable emissivity feature”. Some are factory set for emissivity of 0.95, or in the case of our IRFS, 0.97.

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## What is a normal forehead temperature?

The average body temperature is 98.6 F (37 C). But normal body temperature can range between 97 F (36.1 C) and 99 F (37.2 C) or more.

## What is the ideal distance for using temperature gun?

Usually, 6 inches is considered the ideal distance for using an infrared thermometer and correctly monitoring the temperature.

But the temperature readings vary depending on which one you use, and you need an accurate body temperature to determine if a fever is present. A forehead (temporal) scanner is usually 0.5°F (0.3°C) to 1°F (0.6°C) lower than an oral temperature.

## Is a temperature of 37.7 normal?

Although 98.6° F (37° C) is considered normal temperature, body temperature varies throughout the day. It is lowest in the early morning and highest in the late afternoon—sometimes reaching 99.9° F (37.7° C). Similarly, a fever does not stay at a constant temperature.

## What is considered a fever with infrared thermometer?

Read the thermometer screen. Temperature is less than 35°C, take temperature again. Temperature is 38°C or higher, this person has a fever.