Add to Wishlist OTC 5020 Diesel Compression Tester with Adapters OTC 5020 Diesel Compression Tester w/ adapters Easy-to-use compression tester is designed specifically for medium-duty diesel engines equipped with glow plugs, dual reading gauge measures compression to 1000 psi and 7000 kPa Gauge has a push-button... MSRP: $611.07