The total count, 1min., 10min., and 50min average are displayed with a trend graph.

The trend data can be saved to SDCARD.

GM tube: SBM-20 or Si-29bg (work at 400V)

Daughter-board curcit: HV supply and sense amp.

photo: assembly overview.

LCD backlight control is added for power-save.

JOYSTICK UP:ON / DOWN:OFF