Product Details The casing is of a high profile AI-Zn alloy produced by Pressure Die CastingBellows are of proven material for long-lasting and better repeatabilityThe sector mechanism is specially designed for maximum repeat accuracyPrinted Dial has 20 to 300mm of Hg scale with 2mm of Hg resolutionCrystal clear cover glass for best visibilityAll plastic and rubber parts are of first-grade virgin materialMetal parts are treated with Nickel and Chromium plating to prevent corrosionBest quality painting is adapted to the whole body of the instrumentSpecial cuff is provided for getting an excellent gripSoft carrying case for ease in handling Portable, easy to carry model Field calibration feature Optimum damping effect for easy and fast measurement This apparatus comes with a new concept of self-calibration of the Dial Gauge, on-field by the user. This instrument comes with a small KEY to adjust the calibration error in due course due to the usage of the unit Available in Velcro-type fastening cuff Measurement Unit : mm Hg Resolution : 2mm Hg Measurement method : By Auscultation with Stethoscope Pressure display range : 20 – 300 mm Hg Accuracy : +/- 4mm Hg (Pressure) Cuff size: 14.5 cm x 51 cm Pressurization: Manually by rubber bulb Deflation: Hand held pressure control valve