Virtually indestructible design can withstand repeated drops of 5 feet or more. Splash resistant housing for use in harsh environments. Extra large LCD digits are easy to read. Backlit display for easy reading even in low light conditions. Swivel cuff clip allows the manometer to be re-positioned for easy viewing. Auto off function conserves battery strength. Dual low battery warnings. Recalibration reminder after 10,000 cycles (free lifetime recalibration). Systolic assist alerts practitioner to the onset of Korotkoff sounds - makes a great training aid. Deflation rate display promotes proper technique in accordance with AHA guidelines. Pulse rate display at completion of measurement. New reading lock feature allows practitioner to lock in systolic and diastolic values during measurement. Manometer works with virtually every cuff on the market.