TU-15 Diesel Compression Tester: Designed to measure cylinder pressure on diesel cars and trucks. Comes with handy deflator for air releasing and automatic resetting of the gauge for repeat testing. Precise Pressure Gauges: Dual scale dial with ranges from 0-1000 PSI / 0-70 bar. 2 scale red & black 2-1/4" gauge, more easy to read, efficient & convenient. Precise scale for accurate pressure measurement. Sturdy Gauge & Hose: .