You´ll probably don´t have to worry too much on that anyway. Either your string/whatever is not in tune, that´s why it blinks. It could be low battery. Or it could be that it works this way, blinking to show it´s reading. Most of the time is the first issue. Anyway, my advice to you is read the manual. But as long as you see the meter pointing at the right pitch, then you´ll alright. Cheers!