Background
Two tools for the same signal
Both measure the erections that happen during sleep. FirmTech notes that measuring them used to mean a sleep lab, and built the TechRing so men can do it at home, in their own bed, as often as they like.
FirmTech is running a clinical trial comparing the TechRing with RigiScan, with 35 men enrolled, according to its clinical studies page. Results were not published as of November 2026.