Graham Field Tuning Fork - Adjustable Frequency Stadiometer About the ResMed AirTouch F20

About the ResMed AirTouch F20 Cushion

Contours to a range of facial structures with one-step fitting

About the Zen-O Lite Sieve Bed

Extension Reclined from Back of Seat to End of Foot Rest: 42

Allows for effortless turning into desired position

Graham Field Tuning Fork - Adjustable Frequency Stadiometer About the ResMed AirTouch F20Graham Field Tuning Fork Adjustable Frequency Features All aluminum tuning fork Scale letters are stamped on stems Specification Brand: Graham Field Product Type: Tuning Forks Tines: 3 8 Length: 8" With Adjustable Weight Scale in Seven Frequencies: C128, D144, E160, F170. 7, G192, A213. 3 and B240 (weights removed)