1. From the Home Screen press the F5 key (the information symbol)
2. You will then notice a screen offering different barcodes and phone numbers on it.
You can find your Firmware version under the Calibration phone number where it says Version:
3. To find the last calibration date, press the F4 key (details)
On this screen you can find the date the unit was last calibrated towards the bottom left corner of the screen titled Calibration