Alistair Dickie shows off his BlueFlyVario in a Sick of Beige DP5031 translucent blue custom case:
The BlueFlyVario is a flight instrument for measuring vertical speed and altitude based on atmospheric pressure. It consists of a simple hardware device that measures the atmospheric pressure 50 times every second, with a resolution that enables the measurement of altitude differences as small as 10 cm. An Android application connects to the device via bluetooth to provide a detailed display. The application is highly customizable.