It appears to me to be an alignment tool for tuning radio equipment. AM/FM radio receivers, TVs, etc, used to have variable capacitors, inductors and transformers. Technicians would tune the internal circuits at the factory and in the field when repairs were needed. The tool was made of plastic, not metal, so it didn't interfere with the sensitive RF circuits. The business end of the tool would be a plastic blade, hex head, or dual pronged thing. Sometimes the shape was custom so that only factory techs could do the work.

A soldering aid or a pin insertion tool are also a good guesses. I don't ever recall seeing a non-metallic soldering aid or insertion tool but I could be wrong.