Gralab Model 451 99 Minute Electronic Timer/Intervalometer 120V/50-60HZ

The Model 451 is a dual memory switching timer/intervalometer featuring inductive loan and logic level output capabilities. It has all the same features as the 450, plus two independent, separately programmable memories allowing for operation as a single-cycle switching timer as well as a continuously recycling intervalometer, parallel AC and logic level output, and a third time range option that is adjustable in increments from 1 to 99 minutes.