The app included in the following conversion
1. basic units
- Length Measurements
- Space Measurements
- Weights
- Space contents
2. Units of daily. Life
- Currency
- Temperature
- Time
3. Scientific Units
- Physics. Density
- Physics. Pressure
- Physics. Power
- Physics. Working
- Physics. Performance
4. Various units
- Angular dimensions
- Data units
- Fuel (Krafstoff consumption)
Maybe when updates and more conversion parameters are added. But the most important and most common units are already present.
Helpful is the app from my point of view because you do not always have access to the Internet on the relevant Conversion pages has (or will have), yet fast times z. B. wants to determine the fuel consumption. Or perhaps something else. See above.
But must every selbt for to decide if the app is useful for one and / or if you need them. Or just has, if you need them. Can use make you feel. Not always. But someday maybe ever. And then you're glad when you did.