I got a fernox tds meter through PTS (£50 ish). I haven't had time to try it yet, but it looks ok to me. I saw some on ebay, but at least with fernox you are buying a reputable brand.
Same theory though. I always like to show customers the before and after difference and it seems that using an electronic meter is an easy way to do it. I also like to involve customers a bit and try and get them to do some work - so gadgets often help - you have no idea how popular a laser thermometer is!
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