It fluctuates cause of the heat inside the unit. I would let it warm up for a hour or so then reset it so it reads zero and then just leave it. Always use your ear when doing compression. The meter is just a guide but not that accurate.
Thanks,
I didn't realize that they don't stay on zero due to heat. Odd for such a pricey unit. I do typically use my ears when compressing, but the OCD in me was expecting the meter to be at zero when no signal was being passed through it.
I hear ya, thats how I learned about the heat issue. I would set it and then and hour later it would be off. Pissed me off hahah. Now when I turn it on its off quite a bit after an hour or so it back to normal hahahah. I have two of hairball's meter in my Dual LA2A.