The manometer hvac with 4.45cm × 4.95cm high-definition display screen, which is clear and easy to read, also supports LCD backlight display, and can easily read data even in dark environments. 12 optional units (mmHg, inHg, ftH₂O, cmH₂O, inH₂O, Pa, KPa, mbar, bar, psi, Kgcm² and ozin²).