Tecmate Vacuummate ME - Built-In-Battery TS-71 The industry standard for fast and precise synchronizing of 2- and 4-stroke, two-, three and four-cylinder engines (synchronizes up to 6 cylinders with optional adapter) No fragile glass, no toxic mercury, no mechanical friction or inertia, no calibration hassles Solid-state medical-grade sensors are drop-proof, and self-calibrate for barometric pressure changes Shock- and water-resistant composite molded polyurethane and polycarbonate casing is strong and resilient Vertically arranged LED bars (40 LEDs in each bar) provide clear visuals (even in sunlight) of signals derived from solid-state electronic pressure sensors