Extech Instruments RH550 - RH550 Date and Time Configuration; RH550 Information Screen Details

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4.6 DATE & TIME SETTINGS
Set the system date and time by tapping the small arrow on the programming field to open
the interactive calendar.
4.7 INFORMATION SCREEN
View manufacturer name, model number, current firmware version, date/time of last
firmware update.
See the Firmware Upgrade section for details on updating the RH550 firmware