This document specifies minimum requirements for design and testing of contents gauges, which are directly connected to LPG transportable pressure vessels, LPG drums, LPG cylinders and static LPG pressure vessels above 0,5 l water capacity excluding those used for automotive containers. This document includes minimum requirements for the safe interchangeability of telemetry equipment, which is either integral in or additional to the contents gauge. This document does not apply to refineries or other process plants.