Digital caliper button guard

I realised I was getting through WAY too many LR44s because the buttons on my calipers sit proud and get switched on in my tool drawer. I mean, I could just get some newer, better calipers, but where's the fun in that?

The buttons on my calipers are approx 9.5mm apart and 6mm long. I would give more accurate measurements, but they're currently attached to the measuring tool.