This vintage Allen compression test gauge is a must-have for any car enthusiast. The gauge is designed to measure the compression level of your vehicle's engine, helping it run smoothly and efficiently. The gauge is made by Allen, a trusted brand in the automotive industry, and comes in a sturdy metal box for safekeeping and easy storage. This compression tester is great for diagnostic service tools and is a great addition to any automotive tool collection. Get your hands on it today! Pre-owned untested condition with typical wear. As is. See photos.