NYOrtho ZERO G Heel Pillow™, 1 Each Heating Units UPPER EXTREMITY * Hand Set Style:1 Pair (Left & Right) UPPER EXTREMITY * Hand Set * Designed to objectively measure volume of the body parts by using the fluid displacement method where the body part is placed in a water filled tank and the resultant overflow is collected and measured * By taking measurements over time edema can be measured and quantified * Includes volumeter overflow cup and graduated cylinder * 5 Seat To Floor Height 19 stretch cover with antimicrobial protection reduces friction Recommended use: individuals unable to avoid long periods of uninterrupted pressure over bony prominences are at increased risk for the develpment of necrosis and ulceration