Question: Does a device exist that I can use to measure my erections over time, without having to go to my urologist?

There is a company in Spain called UROAN 21 that has a patented device for measuring axial rigidity of the penis, which I believe is still only available via a urologist's office.  There is another home-based device though that you can take a look at here called the EQM . If you suffer from erectile dysfunction, or just want a way to monitor the strength of your erections over time, this is a great little device to have.  Erectile quality has even been shown to be an early warning detector for more serious conditions such as heart disease and diabetes.