Mine is sensitive to air flow, but it only moves in minuscule .02 hundredths of a grain amounts, and that’s ONLY when the central air is on and I can feel the air flow on the back of my neck or I sneeze right by it, lol. If I’m weighing charges, I usually turn the Central Air or vent off. I do use a surge protector on it tho bc I don’t wanna lose something that nice. I use a Lyman Gen6 to auto throw charges 0.1 tenth under, manually transfer to the charge to the FX120, then manually trickle up. The Lyman is usually within a tenth for me, but sometimes it’s way worse for no obvious reason, but still gets me close enough to trickle up to my desired weight. The FX has been stellar. I check it against cal weights every time I use it, & the only time it’s been off is when I moved it, & forgot to center the level bubble back to dead center. When I re-leveled it, the value was back dead on.