The Yin (Chinese: 引; pinyin: yǐn) in Mandarin, or jan in Cantonese, is a traditional Chinese unit of length. One yin equals 1/15 of a li, 10 zhang, or 33+1⁄3 m in China.
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Present law on Chinese length units
This law of length measurement was issued by the Chinese government in 1929, and has been effective since 1 January, 1930. The base unit chi is defined to be 1/3 meter.
Chinese length units in engineering
These units are based on the metric system. The Chinese word for metre is 米 mǐ, which can take the Chinese standard SI prefixes (for "kilo-", "centi-", etc.).
In the engineering field, traditional units are rounded up to metric units.