The present invention pertains to calibration in current sensing applications. In some embodiments, a device includes a packaging apparatus and contact pads disposed on the packaging apparatus. The first and the second precursors are reacted in the ALD precursor to form a metal sulfide thin film on the substrate. On filling a pressure vessel, a pressure pump then supplies the preservative and fluid mixture under pressure to the pressure vessel in which the wood or wood product is being treated. The command is discarded if not relayed to the smart card reader.