I have a good working sun nuclear continuous radon monitor model 1028 for sale no longer need this unit. This monitor will need calibrated check the link for more information http://ebay.to/2arRjIO
I can get a new one that is calibrated for $995 directly from Sun. You are selling this used one for $850. The cost of calibration and shipping would make this more than a new one.
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Good luck at that price.