Checkline DFX-7 - Manual (Page 50)

Dakota Ultrasonics
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3) Press the UP and DOWN arrow keys to toggle the coating option on/off.
4) Wipe all couplant from the transducer face and proceed to the Probe Zero
section that follows.
In this second example the transducer was not identified and will force the user to
select the transducer type from a predefined list of transducers:
Selecting the Transducer Type
5) Press the OK or ESC keys to display the factory list of transducer types (by
diameter and frequency).