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There are exists two methods to check your water hardness (TDS of water). The first and the most difficult and expensive method is checking your water quality in laboratory. The second and the easiest way is to use TDS tester-meter. TDS meter (Total Dissolved Solids meter) is a device, which can help you to make a measurement of your water PH level. On Filterway.com, you can find and buy online a wide range of handheld TDS meters from HM Digital company, which have a size of a pen and will not take a lot of space in your home. Also we’ve got a lot of handheld TDS meters with very attractive price for sale.