Strong SRT 5392 User Manual page 39

2. To change the size of the zoom rectangle:
• Press the red button to enlarge it.
• Press the green button to shrink it.
3. To change the central point of the zoom rectangle, press CH ▼, CH ▲, VOL
4. Press OK to zoom in or out.
5. Press EXIT again to cancel zooming.
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or VOL.