154-0703-00
The Tektronix T211-31-1 (P/N 154-0703-00) is a CRT 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.