There are four display modes, Dose Rate, Graphic, Dosimeter, History Mode and Menu Mode
Dose Rate Mode:
Dose Rate in CPM Dose Rate in µSv/h
Dose Rate in mR/h Dose Rate in average CPS per minute
Key2 and Key3 toggles between CPM, µSv/h, mR/h and CPS units
Navigation keys:
Key1: Dose Rate/Graphic/Dosimeter/History Mode Selection
Key2: CPM,µ, Sv/h, mR/h, CPS selection
Key3: CPM,µ, Sv/h, mR/h, CPM selection. Or hold for 2 seconds to enter menu mode.
Key4: Power Off (when hold for 3s)