Renschler has been developing and producing flight instruments since 1983.
The CoMo Av is the latest flight instrument from Renschler. The design and ergonomics are quite unusual, which is what Renschler CoMo fans like best about it. The concept behind the CoMo is that it is a modular instrument. In theory, you can purchase the basic CoMo AV and then add on GPS and Solar/GPS modules to upgrade the instrument to a high spec GPS Vario.