Unit Converter Length
- Support Multiple Unit Conversion Length:

- Support 1. Metrics -> Metrics:
i) Mode 1:
[Kilometer, Meter, Decimeter, Centimeter, Millimeter, Micrometer, Micrometer, Angstrom] [Millimeter, Meter, Decimeter, Centimeter, Millimeter, Micrometer, Nanometer, Angstrom]
(ii) Mode 2: [km, m, dm, cm, mm, um, nm, Å] -> [km, m, dm, cm, mm, um, nm, Å]

- Support 2. Metric -> Imperial:
i) Mode 1:
[Mile, Metro, Decimeter, Centimeter, Millimeter, Micrometer, Nanometer, Angstrom] -> [League, Mile, Furlong, Chain, Bar, Yard, Foot, Link, Hand, Inch, Line, Mil, Thou]
ii) Mode 2: [km, m, dm, cm, mm, one, nm, Å] -> [League, mi, Furlong, Chain, rd, and, d, Brace, Link, Hand, in, Line, Thousand , thou]

- Support 3. Imperial -> Imperial:
i) Mode 1:
[League, Mile, Furlong, Chain, Bar, Yard, Foot, Link, Hand, Inch, Line, Thousand, Thou] -> [League, Mile, Furlong, Chain, Bar, Yard, Hand, Inch, Thread, Thousand, Thou]
ii) Mode2: [League, mi, Furlong, Chain, rd, yd, Brace, Link, Link, Hand, in, Line, Thousand, ft, link, hand, in, line, thousand, thou]

- Support 4. Imperial -> Metric:
i) Mode 1:
[Alloy, Mile, Furlong, Chain, Bar, Yard, Foot, Link, Hand, Inch, Line, Thousand Thou] -> [Kilometer, Meter, Decimeter, Centimeter, Millimeter, Micrometer, Micrometer, Angstrom]
ii) Mode 2: [League, mi, Furlong, Chain, rd, yd, Braça, ft, Link, Hand, in, Line, Thousand, thou] -> [km, m, dm, cm, mm, um, nm , A]

- Fast calculation ~~

- High Accuracy: (1) 99% of cases have> 11 decimal places for decimal number "infinity".
(2) precise decimal value for the "finite" decimal number.

- Suitable for work / homework / learning purposes.