Honestly those old fiber optic meters are built like tanks. We kept one as a backup for years because the digital ones can act up in really cold hangars. As long as it's been calibrated, that 0.1% check is solid. Might be worth hanging onto it just for peace of mind.

Try adding a color that scares you a little.

Honestly, the noise from pushing a small tool too hard is awful too (and bad for your ears long term). It's not just about the motor burning out.