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Grey rectangular timer with two-digit LED display and start reset bar

GraLab

GraLab 451 99 Minute Electronic Timer/Intervalometer 120V 50-60Hz

SKU CH-XSTX-PGW7E MPN 451

Solid-state timer with dual programmable memories, 99-minute range, two-digit LED display and 120 V 50-60 Hz operation

  • 99-minute range with tenths-of-second precision
  • Two independent programmable memories for flexible timing
  • 100% solid-state construction ensures digital accuracy
  • Two-digit LED display simplifies time setting
  • Auto-start feature enables continuous cycling operation

Purpose and User

The GraLab 451 is a solid-state electronic timer and intervalometer built for darkroom, laboratory and studio use. It suits photographers, technicians and educators who need repeatable timing from tenths of a second up to 99 minutes.

Timing Limits

The two-digit LED display shows minutes and seconds with tenth-second resolution across the full 99-minute range. Two independently programmable memories allow single-cycle or continuous auto-cycling operation, and the START/RESET bar halts a cycle and returns the timer to its original setting instantly.

Power and Setup Checks

Verify that the installation site supplies 120 V AC at 50 or 60 Hz, as the unit is rated solely for that voltage and frequency. Confirm that the two-digit readout provides sufficient resolution for the shortest exposures you plan to run.

Highlights

  • 99-minute range with tenths-of-second precision
  • Two independent programmable memories for flexible timing
  • 100% solid-state construction ensures digital accuracy
  • Two-digit LED display simplifies time setting
  • Auto-start feature enables continuous cycling operation

Specifications

No published specifications for this item yet.

Questions about this item

How do I choose between using the two programmable memories for single-cycle switching versus continuous cycling?

The Model 451 provides two independently programmable memories. Use one memory for a single on/off cycle or both memories together for auto-start continuous cycling depending on your timing needs.

What does the 99-minute range mean when I set exposure times in a darkroom?

You can programme any interval from tenths of a second up to 99 minutes, and the two-digit LED display shows the remaining time as it counts down.

How does the 120 V 50-60 Hz rating affect where I can plug the timer in?

The unit operates on standard 120 V mains at either 50 Hz or 60 Hz, so it works on North American power without a converter.

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