Baum Pocket Aneroid w Adult Cuff Training Stairs Ramps Covers 360¯ (Displays +180¯ to Otoscope Accessory Covers 360¯ (Displays +180¯ to 180¯) 685 mm Legs Closed Internal Width The Baum Pocket Aneroid is a 300 mmHg portable instrument * It's built to agree with our master instruments which are traceable to the United States National Institute of Standards and Technology * It complies with ANSI AAMI SP 9 for accuracy and performance (1% full scale + 3 mmHg) * The unique high contrast scale and red pointer increase visibility and reduce parallax error * They are manufactured with a precision low friction movement and twin pre seasoned phosphor bronze diaphragm capsules *