It measures everything passing into the property. That means it can tell you whether water is being lost even when there is nothing to see, which is the single most useful thing to know before anyone starts looking for a leak.
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For a burst pipe or a serious leak, turn the water off at the mains tap before you call. If water is anywhere near power points, the switchboard or light fittings, stay clear and treat it as an electrical hazard. Do not enter standing water in a room with live power.
