O-Dive - Personal Doppler Ultrasound Device

Just like new... it's possible it hasn't been used.  The O-Dive personal doppler ultrasound device allows divers to check and monitor their body for bubble formation after diving.  The device connects via bluetooth to the O-Dive app on your phone.  From O-Dive:

O'Dive Sport is a connected, personal Doppler ultrasound device and app designed for recreational scuba divers to measure post-dive vascular microbubbles and assess decompression quality. It enables air or nitrox divers (up to 40m) to personalize their safety protocols, aiming to reduce the risk of decompression sickness. 

These units retail starting at $950 and go UP UP UP from there.