Regulations Governing Type Approval of Measuring Instruments Article 8
If it is judged through examination by the dedicated weights and measures authority that an application for type approval or series type approval of measuring instruments conforms to the relevant provisions, the certificate of type approval shall be issued and the type approval marking shall be designated.The type approval marking referred to in the preceding paragraph shall be composed of a series of letters and a serial number. The letters are prescribed as follows:1. The letters for taximeters are "AA".2. The letters for electronic non-automatic weighing instruments are "BA".3. The letters for water meters are "FD".4. The letters for diaphragm gas meters are "FC".The type approval marking shall be engraved or printed on the measuring instruments in visible places, or affixed visibly on the instruments in other permanent ways.
中文原文 度量衡器型式認證管理辦法第8條
度量衡器型式認證或系列認證經度量衡專責機關審查符合者，發給認可證書，並指定型式認證標識。
前項型式認證標識，由字軌及流水號組成；其字軌規定如下：
一、計程車計費表，字軌為「AA」。
二、電子式非自動衡器，字軌為「BA」。
三、水量計，字軌為「FD」。
四、膜式氣量計，字軌為「FC」。
型式認證標識應以鐫刻、印刷或其他永久性方式標示於度量衡器之明顯處。
前項型式認證標識，由字軌及流水號組成；其字軌規定如下：
一、計程車計費表，字軌為「AA」。
二、電子式非自動衡器，字軌為「BA」。
三、水量計，字軌為「FD」。
四、膜式氣量計，字軌為「FC」。
型式認證標識應以鐫刻、印刷或其他永久性方式標示於度量衡器之明顯處。