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iv 07506C DCN6727
Laser Safety
The Ultrafine Particle Monitor – Model 651 is a Class I laser-based instrument. During normal operation,
you will not be exposed to laser radiation. To avoid exposing yourself at any time to hazardous radiation
in the form of intense, focused visible light (exposure to this light can cause blindness), take these
precautions:
Do not remove any parts from the instrument unless you are specifically told to do so in
this manual.
Do not remove the instrument housing or cover while power is supplied to the
instrument.
WARNING
The use of controls, adjustments, or procedures other than those specified in this
manual may result in exposure to hazardous optical radiation, which can cause
blindness.