KYORITSU 2417 - Manual (Page 16)

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6-3 Date Hold
Push the Data Hold Switch Button to freeze the reading. "H" symbol
is displayed on the digital display to indicate that the instrument is in
Data Hold mode.
Push the button again to exit from Data Hold mode.
6-4 Automatic Power Off
Model 2417 automatically turns power off In approx. 30 minutes
after it is turned on. To operate the instrument, set the Frequency
Selector Switch back to OFF position and then ON position.