my test kits? Close. I read my Mag at 1100, they say 1000. I read my alk at 7, they say 6. So there is an offset.
But, I tested the water straight out of the tank. Their test was after 2 days of shipping. Does that affect it? I can't answer that.
Either way, it did confirm I need to start supplementing. My 2-part kit has arrived, and I'll begin after this weekend's PWC.