Beta 1760/IR500 Mode D'emploi page 17

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4. Measurement Distance / Measurement Surface / area ratio (D/S)
To achieve accurate measurements, the target must be larger than the
thermometer's measuring area. The measured temperature is the
average temperature of the area measured.
The smaller the target the smaller the measurament distance between
thermometer and target object has to be.
The distance to target / size of IR local spot ratio is 12:1. Wlth a distance
of 12 cm to the target, the size of the IR local spot is thus 1 cm.