The Diagnostix 720 Pocket Aneroid Sphyg features a precision crafted 300mmHg Japanese engineered manometer with a classic black enamel finish. Its extended scaleplate graduation marks reduce parallax for easy viewing from any angle. The Adcuff nylon cuff displays ADC's Size Guide marking system to prevent mis-cuffing. Dust build up is reduced by the Adflow filter screen and the deflation valve. Deflation is precisely controlled with the Adflow chrome-plated brass air release valve.