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ＨＭ－５２０是小型轻量的木材水分计。该仪器能够不损伤的木材的表面，采用高波式的测定方式，轻轻地压在木材表面进行测定。建筑用木材的针叶树种要达到内部干燥状态需要相当长的时间，仅从其表面的干燥状来判断，会产生种种问题。而做为能够从表面到内部测定木材的水分ＨＭ
HM-520 is a small lightweight wood moisture meter. The instrument can not damage the surface of the wood, using high-wave-type determination, gently pressed on the surface of the wood to be measured. It takes quite a long time for coniferous species of construction timber to reach the internal dry state, and problems arise only from the dryness of the surface. It is moisture HM which can measure wood from the surface to the inside