Vanguard VCBA S2 (DigiTMR S2, DigiTMR S2 PC, CT-6500 S2, CT-7000 S2, CT-7500 S2, CT-8000) - Manual (Page 35)

REV 3 VCBA S2 VERSION 4.xx SOFTWARE MANUAL
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3. Left click and hold down the left mouse button. Drag to the second point on the graph.
The selected area will be highlighted: