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A butane lighter or magic marker works well to <br /> demonstrate that the OVA is responding. <br /> These "response checks" are key to providing confidence <br /> to the user that the instrument is at least functioning and <br /> responding to contaminants. <br /> The same type of response check can be performed with the <br /> radiation meter using low level test sources with the appropriate <br /> type of probe (alpha, beta, or gamma) . <br /> /H&S2 <br /> HAS-PRO601 HS-601-5 November 1990 <br />