The "pro" version of the Vspeak-Vario has a higher sensitivity than the standard version. The properties of the used Swiss precision pressure sensor in the "pro" version which is manufactured in modern MEMS technology allows a faster response and results in less noise.
Furthermore the "pro" version has been equipped with an acceleration sensor which has an extended measurement range of +/-24g in all three axes.
Single cell monitoring and logging of measured values carried out like standard Vario.
Externally the VSpeak-Vario "pro" can be distinguished from the standard version by the logo "pro" on the bottom of the vario.
More info here - this is the Powerbox P2Bus version http://www.vspeak-modell.de/en/variometer/pro-vario