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About GraLab

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.

GraLab Features

  • Reliable and accurate time after time
  • Two digit display
  • Pushing the START/RESET bar during a cycle stops the timer and automatically resets it to the originally set time.

GraLab Specifications

Time Range
seconds to 99
tenths of seconds to 9.9
1 to 99 minutes
Better than ±.01% @ 1 second relative to power frequency (20°C ambient, no load)
Repeatability: + .005% @ 1 second relative to power frequency (20°C ambient, no load)
Max. Lamp Load
@ 120 VAC: Max Lamp Load 600W
Max. Resistive Load
1200 W
Max. Motor Load
1/3 HP
Number of Outlets
Audible Options
3: off, metronome and end-of-cycle tone
dual memory
2-digit LED
Auto Reset
Foot Switch
100-130 VAC, 50 or 60 Hz (U.S. & Canada)
3.5 x 4 x 8"
Housing Material

Reviews about this item

Reviewed by 1 customers


Very simple to use,very liable unit


from GA,Atlanta

We use this product to test our systems for Power Cycles.

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