標準法碼是日本時期傳遞質量標準單位之用。使用時以等臂天平檢定，天平的一端放置標準法碼，另一端則為送檢的法碼，以檢定送檢法碼是否符合重量標準。本組法碼共有14個，最重的1貫，最輕的5分。

The standard weights were used during the Japanese period to transfer mass standard units. They are verified using an equal-arm balance, with one end holding the standard weight and the other end holding the weight being tested, allowing for the verification of whether the tested weight meets the weight standard. This set includes 14 weights, with the heaviest being 1 kan and the lightest being 5 fen.