Where are the mounting holes?
The microAlt series is intended to be mounted directly in small diameter body tubes via friction fit . A single wrap of weatherstrip around the battery portion of the altimeter provides a snug fit in a 24mm tube, and common foam pipe insulation works well with larger sizes. This allows rapid removal and installation, facilitating swapping one altimeter among a number of rockets (for club contests, etc). More elaborate mounting schemes are covered in the manual, including remote power and arming switches.