This is the tuner metronome that you should buy.
I can’t emphasize enough how important it is to use a metronome when you are practising and this one is bulletproof.
It is a 2in1 product, so you don’t have to buy/carry two things and it is well made and won’t break.
I sound like a salesman, but I’m just trying to save you stress in the long term.
Please buy this if you don’t already have a metronome.
The cheapest place I’ve found is GAK.