I can relate to RobH and Keith's words! The TDS meters are really great. Especially taking into consideration the fact that they are kind of ... really cheap, it makes them one of the best products on the market, taking into consideration the price per quality ratio. I am having an issue with my roof as I have found a couple of water leakages. I already called the guys from https://city2surfroofing.com.au/roof-repairs-sydney/, as they are probably the best specialists in roof repairs. Hope they will do it all right.