Do not know how to test it. It was my uncles. It last worked when he used it, but I do not know how to test it.

This RCA Solid State Oscilloscope WO-505A is being sold for parts or repair, and is not in working condition. Despite this, it still boasts the high-quality and reliable craftsmanship that RCA is known for. With this item, you will receive a valuable piece of equipment that can be used for spare parts, or repaired for full functionality.

The brand of this oscilloscope is RCA, a reputable and well-known company in the electronics industry. It falls under the category of Test, Measurement & Inspection, and Test Equipment Manuals & Books, making it a valuable addition to any collection. While it may not be in working condition, it can still be a valuable asset to those who are in need of spare parts or who are skilled in repairing electronics.