Does anyone know of a tool that can be used to determine the bolt diamater, thread type, size of any bolt..and do you know of a source to find a huge range of nuts, bolts screws etc to buy.
If I am working on my car or motorcycle or machine, I would like to be able to determine the info on the bolt and have a place to quickly buy a replacement instead of having to order once bolt at a time thru the mangufacturuer. I have tried getting replacements at the hardware store but the selection usually is not complete enough

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1996 E320
2000 C230 Kompressor
1988 190e 2.3 - 225K miles, owned for 7 years. I cannot say enough good things about this car. Very well built, even at 225 it ran like new.