The Milton Compression Tester Gauge is a reliable tool for automotive diagnostics, offering a maximum pressure of 300 PSI for accurate testing. With a composite metric scale in pounds per square inch, this tester allows for precise measurements to ensure optimal engine performance. The brand Milton, known for quality tools in the automotive industry, guarantees a durable and efficient product with the manufacturer part number 1977. This compression tester is a key diagnostic service tool for car enthusiasts and professionals alike.