Maser is a sounding rocket that is used in the MASER microgravity research rocket programme, which is operated by the Swedish Space Corporation (SSC). The main customer is the European Space Agency (ESA), and in particular its EMIR and ELIPS programmes.
The launches take place at Esrange in Northern Sweden. The programme offers 6-7 minutes of microgravity and full recovery of the experiment modules with helicopter immediately after flight.
References
Maser (rocket) Wikipedia(Text) CC BY-SA