WellMeter
Measure the depth to water in a well with nothing but your iPhone's speaker and microphone.
An echo, timed precisely
Hold your iPhone over the well opening and tap Measure. WellMeter plays short chirps down the casing, listens for the echo off the water surface and times the round trip. It repeats the measurement until the reading converges, corrects the speed of sound for air temperature, and keeps its chirps inside the frequency band your pipe diameter carries cleanly.
Five things that help
- Point the phone's bottom edge — the USB-C port and speaker — straight down into the centre of the well.
- Hold it a few centimetres above the opening, as still as you can, for the full ~10 s.
- Keep it clear of the walls, and don't cover the bottom speaker or microphone with your hand or case.
- Measure in quiet conditions — background noise hides the echo.
- Turn the volume to maximum and disconnect headphones.
Free to try, one payment to keep
WellMeter is free to download. Start the 15-day free trial inside the app to use every feature. After the trial, new measurements require a one-time purchase — no subscription, no ads, no account. Your saved measurement history stays available either way.