Hanna Instruments HI 98170 - Manual (Page 6)

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10) key, to manually decrease temperature or other parameters.
RCL key, to enter/exit view logged data mode.
11) LOG key, to store measured data.
CFM key, to confirm different values.
12) AutoEnd key, to freeze first stable reading on the LCD.
CLR key, to clear calibration or logged data.
13) LIGHT key, to toggle display backlighting.
14) Secondary LCD.
15) Primary LCD.