[emeritus]

I still have (and regularly use) a plastic vernier callipers (imperial, and with a non-vernier metric scale) that dad got free with "Practical Householder" circa 1960. Being plastic it is good for checking the dimensions of button cells. It has been kept in a cool place (the garage) for the past 40 years and although now some 60 years old, still agrees to within a 'thou with my micrometer screw gauge. Precision plastic! I also have a couple of transistors that came with a "Wireless World".