154-0703-00
The Tektronix 154-0703-00 (T211-31-1) is a cathode-ray tube for miniature scopes.
Standard phosphor is P31. The (non-illuminated internal) graticule has 6 × 10 divisions of 0.203" (5.16 mm) each.
Typical acceleration is -1 kV at the cathode, no post-acceleration.