Decades of use of the RigiScan® Rigidity Assessment System have demonstrated that healthy men have somewhere between 3 and 6 erections every evening. Experts speculate as to the purpose of these nocturnal erections but one widely accepted theory is that nocturnal erections cause blood to flow to the penis which increases tissue oxygenation and penile stretching. If accurate, the theory would indicate that nocturnal erections are really a form of penile “exercise” intended to keep the penis healthy so that it is ready for sexual activity when the opportunity presents. Unfortunately, the quantity and quality of nocturnal erections decreases as a man ages or experiences health conditions such as diabetes or cardiovascular disease. As the quantity and quality of nocturnal erections decreases over time, the man’s penis gets less and less “exercise”. Decreased penile “exercise” causes the tissues inside the penis to become less and less healthy and, in many cases, the man will begin to develop the signs and symptoms of erectile dysfunction which can include the ability to get, but not maintain an erection or the loss of an erection during intercourse. Once a man experiences these problems, he will be faced with managing erectile dysfunction for the reminder of his sexual life. While not intended to diagnose, treat, or prevent any disease, the Snap*Gauge^® is a simple, inexpensive, non-invasive single-use band that is placed around a man’s penis to help him determine whether or not he is still having nocturnal erections. The Snap*Gauge^® device is simply placed around the penis and secured using velcro just before bed. The Snap*Gauge^® has three tension bands that snap one by one as the penis get bigger during an erection. When placed properly on the soft penis before sleep, the bands will snap as the penis size increases. The first band snaps when the penis is firm, the second band snaps when the penis is full, and the third band snaps with hard and rigid penis.