I was dubious as so cheep and broke the battery cover trying to get it off (turned out the edge wasn't made smoothly so was caught) BUT it is so useful for £3.50. Easy to use and quickly tells you if a cable isn't inserted or reassures you that your cables are fine. Really glad I took the risk. PS looks different from picture and is very small (approx 10x10x3cm) with pouch.
If the battery cover hadn't broken would get 5 stars. What more can you ask for £3.50....
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