Innova Compression Tester Plus 6-Piece Kit — 2.5" Dial, Dual-Scale Gauge for Cars & Small Engines

The Innova 3614 Compression Tester Plus is a six-piece diagnostic kit that measures cylinder compression to help locate worn rings, burnt valves, damaged pistons, and head gasket issues on cars, motorcycles, ATVs, and marine engines.

This compact kit combines a large, easy-to-read dial gauge with multiple thread adapters and a durable hose to perform reliable compression checks on conventional, electronic and computerized domestic and import vehicles. The tester uses a Bourdon tube movement and dual-calibrated, color-coded scales for straightforward interpretation. Included adapters cover common spark plug thread sizes so you can test passenger cars as well as smaller engines without extra purchases.

How does the Innova 3614 reveal engine problems?

The tester measures cylinder pressure during a cranking stroke and displays peak compression on a 2-1/2-inch dial. Comparing readings across cylinders helps pinpoint anomalies such as low compression or wide variances that indicate mechanical issues.

• Measures peak cylinder pressure in psi/kPa on a dual-calibrated dial
• Large dial and color zones make low, acceptable and high readings easy to spot
• Repeatable tests enabled by the side-release valve without disconnecting the hose

What vehicles and engines will this kit fit?

The kit supports most passenger vehicles and many small engines through its selection of adapters. It includes accessories to test standard automotive spark plug threads along with adapters for motorcycles, ATVs, snowmobiles and marine applications.

• 14mm and 18mm adapters for most car and truck spark plug holes
• 10mm and 12mm adapters for many motorcycle and small-engine applications
• 14mm long-reach adapter for deep or recessed spark plug locations

What features improve durability and usability?

The Innova kit is built for shop and field use with quality materials and convenient controls to speed testing. The hose and fittings are rated for high-pressure use, and a stainless steel casing protects the rubber hose from abrasion and heat.

• 15-inch high-pressure rubber hose with stainless steel casing for protection
• Brass fittings and properly rated fuel-hose components for longevity
• Side-release valve for quick pressure release and repeated testing

How do I read and interpret the gauge?

The dial displays dual scales (psi and kPa) with color-coded sectors to quickly identify acceptable versus low readings. Compare each cylinder’s peak pressure to the manufacturer’s specification and to other cylinders to evaluate engine health.

• 2-1/2-inch dial with Bourdon tube movement for accurate readings
• Dual-calibrated scales eliminate guesswork between metric and imperial units
• Color-coded zones speed visual assessment of out-of-range cylinders

Who is this for: The Innova 3614 Compression Tester Plus is aimed at DIY mechanics, independent technicians, and fleet maintenance teams who need a portable, dependable compression gauge kit. It’s useful for anyone troubleshooting misfires, poor power, or suspected internal engine damage who wants a clear, repeatable method to compare cylinder pressures across a wide range of vehicle and small-engine types.