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The 3810 provides a replacement KH20 Nitrous Oxide Detector Tube. The price listed under Ordering Info is for purchases occurring twelve months after the KH20's ship date. Recalibration must be purchased separately as pn 16560, KH20 Recalibration with Documentation. Tubes must be replaced at the factory; an RMA (Returned Material Authorization) is required. Applicable labor charges will be added to the cost of the tube.