Able • Accurate • Affected • Amount • Away • Back • Celsius • Close • Conditions • Degree • Detect • Detection • Devices • Distance • Electric • Emits • Environmental • Environments • Few • Fields • From • Hybrid • Infrared • Interference • Main • Maximum • Measures • Meters • Models • Motion • Objects • Potential • Radiation • Range • Remote • Sensor • Several • Some • Sound • Sources • Temperature • There • Three • Two • Types • Ultraviolet • Very • Visible • Waves • Within