One of two parts needed to smartify a BMeters GSD8 (sold by Spewa in Europe), with an 18mm sensor.
Adapted from greenmagic version.
You can get the base “adapter_bmeters.STL” from his version. It fits perfectly the water meter.
I changed the sensor holder part and made the hole 18mm wide, and made it 25mm high so that you can fit snuggly a 18mm inductive sensor. I used LJ18A3-8-Z/BX-5V as advised by Peter Brinkman's blog
The author remixed this model.