As a store owner i assure you the last thing i want is a return. That's why I choose to only sell the Grow Boss Mega Meter: because all the other meters were returned at a rate that caused the store to lose money. I, literally, would rather lose a meter sale than risk selling one of those name brand, $100+ ridiculously expensive meters that always seem to die within 6-months.
I can't afford the loss and neither can you and that's still not even the dumbest thing about buying an expensive meter, or a dual-meter that costs even more. After all, cannabis is just a weed and grows just fine outdoors without any help from you. Therefore there is no reason to buy expensive scientific meters that die in 6-months when. So remember, PPMs are more important than pH and if you are in hydro you need to know both.
All Meters Come Calibrated & With FreshBatteries