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 I'll have to check my instructions to be 100% sure, but I swear I remember reading that you're supposed to calibrate the monitor for every use. I know if I don't, I will not get steady readings from day to day. 
				__________________-- Tony
 My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills.  Whee!
 
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