Purity of Mercury 99.99% due to assured triple distillation process. 0 to 300 mm of Hg Scale with elegant finish, fine numbering and durable background contrast paint for clear visibility. Fused type, permanent graduation marking on the glass tube. Special Control Valve for perfect pressure drop. Best Quality Cuff for Getting Excellent Grip. Proven and tested rubber material for Bladder and Bulb to give more durability. Surface Plating adapted to all exposed metal parts to prevent corrosion. Classic Hi-Stove painting to the body of the instrument to withstand in any climate,Optimum damping effect provided for easy and fast measurement.