Agilent Technologies U1602B User's And Service Manual page 106

3 Using the Scope Functions
Figure 3-32 X-cursor measurement for channel 2 signal with X1 and X2 cursor lines
6 In Figure 3- 32, math function is selected.
Figure 3-33 Math functions for X-cursor measurement
70 Agilent U1602B/U1604B User's and Service Guide
X1 cursor line
X2 cursor line