OTC Compression Tester Kit 5606 — Dual-Scale 0–300 PSI Gauge, Case & Adapters

The OTC 5606 Compression Tester Kit is a complete, professional-grade set for measuring cylinder compression on gasoline engines, with a dual-scale 2½" gauge, multiple adapters, long flex hoses, and a sturdy storage case.

This kit equips technicians and home mechanics to quickly diagnose compression-related engine issues across a wide range of gasoline engines — domestic cars, imports, motorcycles, marine motors, and small equipment. Built for shop durability, the 5606 combines a clear 0–300 psi (0–2100 kPa) dial with corrosion-resistant fittings, flexible hose reach, and a blow-molded case to keep parts organized and protected.

How does the gauge deliver reliable compression readings?

The 2½" dual-scale gauge provides an easy-to-read display in both psi and kPa, a chrome bezel for visibility, and a zero-adjust feature for accurate baselines. A protective outer boot shields the gauge from impacts and grime in workshop environments.

• Dual 0–300 psi and 0–2100 kPa scales for international use
• Zero-adjust to correct needle position before testing
• Protective rubber boot and chrome bezel for durability and clarity

Which adapters and hoses are included, and what engines do they fit?

The set includes a variety of thread adapters and flexible hoses to attach to both flat and tapered spark plug seats, covering most gasoline engines. Adapters include common automotive and small-engine sizes so you can test everything from motorcycle cylinders to marine outboards.

• 12" flex hose with 14mm standard fitting for common spark plugs
• 12" flex hose with 14mm long-reach fitting for recessed plugs
• Thread adapters: 10mm, 12mm, and 18mm to fit varied plug seats
• 25" extra-long flex hose assembly with quick coupler for hard-to-see locations

How does the kit stand up to shop use and storage?

Components are nickel-plated to resist corrosion and the gauge assembly is designed to tolerate routine shop wear. All parts nest inside a rugged blow-molded hard case with a removable lid so adapters, hoses, and the gauge stay organized and protected between jobs.

• Nickel-plated metal parts for corrosion resistance
• Rugged blow-molded case for transport and storage
• Repair parts kit included to extend field service life

What practical advantages does using this kit provide during diagnostics?

Quick, accurate compression checks narrow down cylinder issues like worn rings, leaking valves, or head gasket problems faster than trial-and-error approaches. The long, flexible hoses and quick coupler let technicians take readings where visibility is limited, cutting diagnostic time.

• Speeds identification of low-compression cylinders
• Flexible hoses and coupler improve access in crowded engine bays
• Compact case keeps test components ready and reduces downtime

Who is this for? The OTC 5606 Compression Tester Kit is aimed at professional technicians, mobile mechanics, and serious DIYers who service a variety of gasoline engines and need a durable, adaptable compression test solution. It’s especially useful for shops or individuals who require quick access to accurate readings across domestic and imported vehicles, motorcycles, marine engines, and small power equipment. For anyone troubleshooting drivability or engine performance concerns, this kit bundles the gauges, hoses, adapters, and storage needed to perform repeatable compression tests on the spot.