History Mode:
In History mode, the device displays historical data stored in internal flash memory.
It start from first timestamp detected and 4 minutes data thereafter.
Navigation keys for both modes:
Key1: Dose Rate/Graphic/Dosimeter/History Mode Selection
Key2: Next timestamp or next four minutes data whichever first occur.
Key3: Previous timestamp or previous four minutes data whichever first occur.
Or hold for 2 seconds to enter menu mode.
Key4: Power Off (when hold for 3s)