Tektronix 2245A Operator's Manual page 28

Controls, Connectors, and Indicators
Figure 2-1. Crt, power and display controls.
( Y ) CRT—Displays waveforms and readouts in an 80 mm vertical by 100
mm horizontal graticule area.
Internal graticule lines provide parallax-free viewing of trace and
graticule lines. 0%, 10%, 90% and 100% points marked at the left
edge of the graticule aid in making rise- and fall-time measurements.
2 -2 2245A Operators