A new batch of the Altis V4 altitude loggers have just arrived.
Gone is the need for a separate display unit as the Altis V4 has an OLED screen to display information. The memory and other functionality has also been improved. The USB to Serial device is now on-board the device and the supplied cable connects straight to your PC. Go to Aerob Tec website for more specs and information.
Herewith a picture for size comparison with the Altis V3.
A bunch of these devices have been sold already, but I still have some in stock. Contact me if you need one.