This unit is simple to use but doesn't always give a reading. Even when it does it is a bit of a mixed bag as they tend to be all over the place.

Personally I would not rely on this bit of kit as it doesn't appear to be accurate enough. I think investing in something more reliable would be a safer solution. The cost of this was just over £10 so I suppose you only get what you pay for. Not for me though.

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