Click to expand Tap to zoom Particle Energy Spectrometer for Satellite (SPM) by MEISEI Sale ¥0 | / SKU ST00009 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Contact This product is a particle energy spectrometer SPM (SPM: Space Particle Monitor) that uses a semiconductor detector for satellites at altitudes of 400 to 500 km.