What it measures:

The MicroSonde payload enables in-situ measurements of atmospheric features deployable by ground-based balloon launches and air biased balloon launches. For IRISS purposes, it could serve to simplify the UAS deployment mission by making it easier and more affordable to gather data.

Size Specs:

Size: 10g, 17g w/ battery
Processor: 32-bit 32-Mhz processor upgraded from 8-bit 8 Mhz
Battery and Power: smaller high voltage/low current onboard configuration with built-in 3.3V regulation
GPS: M8Q w/ onboard chip antenna
Automation: single-point calibration for all sensors, saved in database on device
Board includes: notches/attachments for magazine loading and balloon attachment