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has to be either free air or another board at a similar moisture content in the same stack, as anything that is conductive (like metal or even your hand) will affect the results. Temperature corrections are generally very minor. Wood density can vary even within a single board or sample, so a dielectric moisture meter reading may be slightly incorrect even if the meter is well-calibrated and even if the species correction has been correctly specified. If the metered location has a density similar to the one that the meter manufacturer used in his calibration curves for the species you are checking, you will likely find that most meter readings are accurate to within ±1% MC of the true value. Due to density variations between and within boards, it’s probably safer to think that 95% of moisture meter readings are accurate to within ±2% MC. Multiple readings within a stack of lumber will give you a better picture of the lumber moisture content distribution than one or two readings. IMPORTANT METER USAGE NOTES. Both types of moisture meters are accurate with standard samples, but due to the limits of what is achievable with calibration of these electronic devices even two well-calibrated meters from the same manufacturer might read differently. Manufacturers such as Delmhorst and Wagner sell calibration standards for their moisture meters, and these can be used to demonstrate that a meter is within calibration tolerances. Delmhorst resistance moisture meters with digital displays are in calibration if they read within 0.2% of the calibration block standard and within 0.5% of the standard for analog resistance meters. The tolerance for most Wagner dielectric meters is ±0.5% MC using their standard calibration plate, so two different meters might read as much as 1% different in the same location. Try not to defeat yourself by taking measurements in obviously inappropriate locations. Regardless of the type of meter, don’t take MC readings close to the end of a board, for example (try to stay at least a foot and a half away), and don’t take readings around knots or distorted grain. The MC might be a little different than the rest of the board in those locations, or dielectric meters might read the MC inaccurately due to density differences. Moisture meters cannot substitute for the use of common sense and good drying practices; they are very useful instruments, but there are too many unquantifiable factors for you to rely upon them for complete accuracy. 32PDF Image | HARDWOOD DRY KILN OPERATION A MANUAL FOR OPERATORS OF SMALL DRY KILNS
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