[Bobby]

Depending on the unit, most modern units will have a shot clock positioned on the console, so that if the shot clock has a problem, the operator can continue to monitor the time on the console, and the official can announce proper times with the unit.

Also, I remember in the early days of the 24-second clock in the NBA, the 76ers once borrowed the 30-second play clock from Veterans Stadium for such use. One possibility is for high schools to purchase a pair of portable 25-second play clocks for football fields for use for that sport, and then be able to take it down and have them stored for basketball use if necessary in case those clocks malfunction.