18-month service type. Brand New Upgrade, Exceptional Quality. We never let you down. Note:This compression tester may not comparable with performance V8 cylinder heads. The spark plug adapters couldn't be used in V8 engines due to clearance issues. Designed to measure compression within petrol engines. 16 " long hose features a push button release valve. Also come with 45° universal direct shaft & straight universal direct shaft. Corrosion resistant, Solid Brass Construction adapters. The most solid brass which means durability & leak-free. No cheap and flimsy aluminum or plastic material.Size： 18mm, 14mm, 12mm & 10mm adapters. Triple range gauge reads 0-300 psi , 0-20 bar and 0-21 kg/cm². Checking compression quickly and accurately. Durable case with soft sponge, hold the whole kit in its portable case keep it safe.