Global Unit Converter Reference

The Global Unit Converter is a comprehensive engineering unit conversion tool built into Plumbing Booster. It supports 27 quantity categories ranging from basic dimensions (length, area, volume) to specialized engineering quantities (viscosity, torque, density, flow rates). The converter maintains per-category favorites and recent conversion history, and can be opened in a standalone window on desktop platforms.

The converter supports 27 quantity categories: 1. **Angles** - radian, degree, gradian, revolution, arcminute, arcsecond, mil 2. **Circular Measure** - turn, quadrant, sextant, octant, degree, gradian, mil 3. **Length** - micrometer to mile, nautical-mile 4. **Area** - square-millimeter to hectare 5. **Volume / Capacity** - milliliter to oil-barrel, including US and imperial fluid measures 6. **Mass / Weight** - milligram to long-ton 7. **Time** - millisecond to year 8. **Temperature** - Celsius, Fahrenheit, Kelvin, Rankine (affine conversions) 9. **Pressure** - pascal to inHg, including meter/foot of water 10. **Velocity** - mm/s to knot 11. **Acceleration** - m/s², ft/s², gravity, Gal 12. **Force** - newton to dyne 13. **Energy** - joule to BTU 14. **Power** - watt to ton of refrigeration, including mechanical and metric horsepower 15. **Density** - kg/m³ to lb/in³ 16. **Flow Rate (Volume)** - mL/s to cubic-foot/hour, including US and imperial gallons 17. **Flow Rate (Mass)** - g/s to metric-ton/hour 18. **Frequency** - hertz to rad/s 19. **Fuel Consumption** - L/100km, km/L, mpg (US and Imperial) 20. **Lighting** - lux to lumen/ft² 21. **Torque** - N·m to kgf·m 22. **Viscosity Dynamic** - Pa·s to lb/ft·s 23. **Viscosity Kinematic** - m²/s to ft²/s 24. **Data Size** - bit to TiB (decimal and binary prefixes) 25. **Electric Current** - microampere to kiloampere 26. **Voltage** - millivolt to kilovolt 27. **Resistance** - milliohm to megaohm

Each quantity category supports independent favorites. Click the star icon (★) next to a unit to add or remove it from favorites. Favorite units appear as quick-pick chips below the unit dropdowns for one-click selection. Favorites are stored in localStorage under the key `pb-global-unit-converter-favorites` and persist across sessions. The structure is a record of category names to arrays of unit IDs.

The converter automatically tracks recently used units per category (maximum 6 per category). Recent units appear as chips below the favorites. Units that are already in favorites are excluded from the recent list to avoid duplication. Recent units are stored in localStorage under `pb-global-unit-converter-recents`.

The converter also tracks recent from-to conversion pairs per category (maximum 10 per category). These appear as chips above the converter panel, showing the format "symbol → symbol" (e.g., "kPa → psi"). Clicking a recent pair chip restores both units instantly. Recent pairs are stored in localStorage under `pb-global-unit-converter-recent-pairs`.

On desktop platforms (Electron), the Global Unit Converter can be opened in a standalone window separate from the main application. In standalone mode: - The converter uses full viewport height - No header or dashboard navigation is shown - A "Close Window" button is provided instead of the dashboard button - The window can be closed via `window.close()` This allows engineers to keep the converter open alongside other modules or external applications.

1. Open the Global Unit Converter from the dashboard module grid. 2. Select a quantity category from the sidebar (use search to filter). 3. Choose the "from" unit and "to" unit using the dropdowns or quick-pick chips. 4. Enter a value in the input field. 5. The converted result appears instantly. 6. Use the swap button to reverse the conversion direction. 7. Adjust precision (decimal places) as needed. 8. Add conversions to the log for later reference. 9. Star units to add them to favorites for quick access.