Transform your automotive diagnostics with this professional-grade 10mm spark plug adapter compression tester. Designed for precision testing of petrol engine cylinders, this 2-piece set helps mechanics and DIY enthusiasts accurately measure compression and detect potential leaks. The adapter seamlessly connects to standard compression testers, allowing for quick and reliable cylinder pressure readings. Made with durable materials to withstand workshop conditions, these adapters feature precise threading for a secure fit. Perfect for engine performance testing, troubleshooting, and regular maintenance checks. The compact design allows easy access to spark plug ports, while the robust construction ensures long-lasting performance. Whether you're a professional mechanic or a serious car enthusiast, this diagnostic tool is an essential addition to your toolbox for maintaining and optimizing engine performance.