Some single or multi-jet water meters (like this one: https://www.heatingandprocess.com/wp-content/uploads/2016/03/Elster-M170-Water-Meter-Product-Data-Sheet.pdf) having an inbuild Magnet Protection against tampering with magnets. My questión is: How effective is this protection or is it necessary to take additional measures to avoid (magnet-) tampering? Especially: How it depends on strength and distance of the magnet from the meter?
I'm not sure about the type of water meter used in your case study city. Indeed that it is necessary to put additional measurement to check the vicinity and efficiency of the water meter.
We just tested magnet protection on test belts in Peru and found them very effective against big neodym magnets - only some little submetering in the minimum flow.
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