Draper-Expert-35885-Digital-Petrol-Compression-Test-Kit-8-Piece-Draper-Expert-35885-Expert-Quality-compatible-with-direct-&-indirect-petrol-engines-which-use-10-12-14-&-18mm-spark-plug-threads-Attached-with-a-digital-LCD-display-gauge-with-a-choice-of-three-pressure-scales-0-300psi-0-20bar-0-2000k Pa-&-fitted-with-a-heavy-duty-rubber-protector-The-braided-stainless-steel-hose-improves-durability-Fitted-with-a-spring-loaded-pressure-relief-valve-&-integrated-Schrader-o