Inch and Metric caliper set. This is a tool you'll find yourself using all the time. Sizing drill bits, what fastener is that exactly? Is that 3/32" or 1/8" balsa? How thick is this potential shim? Is it a metric 2mm or SAE 2-56 push-rod? Is that a 3.2mm or 3mm motor shaft? The list of things you'll find yourself using this tool for us endless. No RC workshop is complete without at least one of these tools.

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