Interesting Apollo-era heart rate gauge, approximately 1.5 x 5 x 5, made by Triplett Co. with a graduated white face and two red adjustable indicators to establish safe heart rate levels. Gauge is labeled inside “Beats per Minute,” with mounting screws on the reverse and several output connectors. RRAuction COA.
We use cookies on this site to improve your experience. By using this site, you accept our use of cookies. To learn more, please see our Privacy Policy.