[Tools] Welldrop

Welldrop lets you measure heights/depths using only a coin!

If used correctly, it can measure with an accuracy of 1cm (1/2"). It's useful for when you don't have a measuring tape or the height you want to measure is high.

The app is super simple to use: Hold the phone horizontally at the height you want to measure. Hold a small coin between your index finger and thumb with a 45 degree angle from horizontal position. Tap "Start new measurement" and drop the coin from 0.5cm (1/4") above the edge of the phone. When the coin hits the floor, the measured height will be displayed.

If you have carpet or other soft floor, place a sheet of paper on it and drop the coin on that. The app uses sound to determine the fall, so coin hitting the floor should make some noise.

See the guide for more details.

Get it from Google Play

Some screenshots:

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