Used Heise Precision Test Gauge 

Key Features:
  • Accuracy ±0.1% of span (ASME B40.100 Grade 4A)
  • Gauge, Compound and Vacuum ranges
  • Pressure ranges 0 to 5,000 psi
  • 300 Degree of pointer rotation
  • Mirror-band dial and knife-edge pointer eliminates parallax error while
    assuring easy readability of precise measurements
  • Solid-front case design and blow-out safety back protect users from
    extreme overpressure