Buhl Spirometer Specialty Scales UPPER EXTREMITY * Hand Set The unfolded towel measures 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 * The other button is for volume Spirometer * Indicator registers forced vital lung capacity up to 7 liters * Needle stays at maximum until reset * Weight: 6 ounces * Can be used as an incentive exerciser *