10 Dec Aero-Gro 12V Timer Programming the Aero-Gro 12 Volt Timer Instructions: 1. To change either the delay time or the run time, press the SET button. The delay time will start blinking. To adjust the delay time up or down, use the... By aww9594 Aeroponics, Articles, Hydroponics, Instructions and How-To Comments Off on Aero-Gro 12V Timer Read More...