• Five detector units consisting of three pairs of vertically overlapping plastic scintillators.
• One of the MUG units is on the ground level, two in a cavern 210 m underground, and one in a container 90 m underground. One unit is placed in Oulu.
• Standard NIM electronics and a personal computer for data storage.
• Data acquisition unit designed and manufactured by Detection Technology Inc. for data recording and pulse height AD-conversion.
• A substantial part of the equipment is borrowed from the Space Research Laboratory of the University of Turku.

Placing of the detector units on different observation levels: