djlen

I use mostly AP kits. Like some of the above responses, they are not the most accurate but I use them more for reference (did it go up, did it go down) than anything else. And after a while I find that pH is about all I have to test for and even that is only occasionally for calculating CO2 PPM when adjusting bubble rates.
If you start using the EI dosing regimen and doing a weekly 50%er there really is no need to test much IMO.

Len

Emc2

Jim, unless things have changed recently you can buy Lamotte kits directly from Lamotte in Maryland. Fresh Water Aquaculture Testing Kits: Aquaculture & Fish Farming Products - © LaMotte Company