Narrative:

During the takeoff; both pfd and the standby airspeed indicator showed zero. [Instructor pilot] decided to abort the takeoff. Reported aborted takeoff to tower; and also let flight supervisor know that we aborted the takeoff due the instrument failure.

Google
 

Original NASA ASRS Text

Title: C172 flight instructor reported a rejected takeoff due to primary and secondary airspeed indication failure.

Narrative: During the takeoff; Both PFD and the standby airspeed indicator showed zero. [Instructor Pilot] decided to abort the takeoff. Reported aborted takeoff to Tower; and also let flight supervisor know that we aborted the takeoff due the instrument failure.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.