Rotary 9036 Compression Tester by Rotary Original price $124.25 Current price $39.13 Sold out 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Sold out PRODUCT INFORMATION Type Other PRODUCT DESCRIPTION DESCRIPTION Specially designed for small engine use . Dual Dial, Metric & American, Chrome Gauge. Has a slide release valve for multiple tests. For use on 14mm & 18mm Plug Holes.