COMPRESSION TESTER Hotsy Pacific Sale! from $94.00 Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Small Engine Test Equipment Designed for small engines 2-1/2" dial reads up to 300 PSI 12" flexible hose to reach spark plug holes Adapters for 14 mm and 18 mm spark plug holes Built-in pressure holding / release valves