Assertion: infrared thermometer | /r/HasAspect | a d/s ratio of eight to one
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Source sentences:
text: If the target you are measuring is six inches in size, and your handheld infrared thermometer has a D/S ratio of eight to one, then the maximum distance at which you can reliably measure the temperature of the target is 48 inches (8:1 x 6 = 48).