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The TruTest 2.2 made by AquaChek is probably the best electronic water test available on the market, it's simple to use and easy to read if your visually impaired or colour blind.
How to use a Electric water tester
How to make a hot tub part 2 - Design Plumbing & Filtration
How to make a hot tub part 1 - Materials Location and Cost
Does a hot tub need an annual service?
How To Upgrade a Chinese Hot Tub Control System