The Weston Master III I used in the 1960s survived much abuse. The meter glass got bashed in, and the only handy replacement was a fragment of a broken ground glass. This might have been the only Weston Master III with a non-glare meter, which was no improvement. The calculator dial got broken off, but calculating the shutter speed and aperture from the meter reading involves only basic math. The meter was otherwise working fine when the camera kit was stolen in 1969. The last time I checked, one Weston Master from the 1930s was still accurate, but the Master II and III are more compact and sensitive. A bit of history: the company that made the Weston meters was founded by an engineer named Edward Weston, no relative to the photographer Edward H. Weston.