Where we mention this product

• 

  essentials

  Hardness Test Kits and Strips: What to Buy

  Budget pick · Best for: Cheapest option at $5.97 — dual-pad design lets you verify each reading; 50 strips, fine for a one-time test

• 

  essentials

  RV Water Softeners: How to Choose the Right One

  Test before you buy · Best for: Confirm campground hardness before sizing a softener; lowest cost-per-test

• 

  problems

  Hard Water Stains in the Toilet (Clean + Fix the Cause)

  Best value test · Best for: Two-pad design that separates low (0–25 gpg) and high (25–250 gpg) ranges — fewer false reads if your water is on the harder end of the scale.