Fishyfanatic
Aquarium Advice Addict
Since they use the AP kit then they probably also test for hardness. At least the places around here do. They also test for Phosphates. Get both the GH and KH tested. Big Al's sells the GH & KH Test Kit for $9. But if your lfs tests for hardness, then I wouldn't worry about buying a kit. It's somethig that gets tested so rarely that unless you have hardness issues, I wouldn't worry about buying it.