GUARD DUTY TIMER counts down continuously to ensure periodic monitoring.

Guard Duty timer

Reliable Timing…

  • Loud buzzer. 103dB warbling tone cuts through the loudest industrial noise.
  • Rugged. Built for rough, wet and corrosive environments.

  • Simple and intuitive. No operator instructions needed.

  • Battery powered. Uninterruptible Lithium battery lasts for years.

  • Easy to use like a kitchen timer.

  • Compact enclosure measures only 5 x 5 inches. 

Guard duty timer is a special variation that is used for routine monitoring. If something needs to be checked on a schedule, or for pacing of production operators, this will sound an alarm if it is not checked. Time can be set up to 99: 99 (hrs/mins).


Once the timer is started by pressing the front green button, the timer counts down. It must be reset before the count reaches zero or an alarm is given. When an operator presses the button, it resets the time with a single button press.  The time may be reset any time before the end of the countdown.  The timing is shut off with a keyswitch.

The button cannot be taped down or otherwise jammed – the timer will alarm. The only way to stop the countdown, and consequent alarm, is to press the button regularly. 


The T5G can be either battery powered or line powered. 

The buzzer can sound at the end of the cycle, along with the LED, or just the LED. (this is a matter of internal wiring so let us know which you want when ordering.)

Tower LED (3 color)

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Magnet Mount TimerMagnetic Mount

Four rare-earth magnets encapsulated in rubber allow the units to be mounted on metal surfaces like ovens. High friction, very strong so the timer stays put.


Tower Light 

Tower LED (3 color)3 color tower light for increased visiblity.


Accessories - Beacon-colors.jpgAlternate Color LED

Default color is red. Amber, blue, green, and white are options.   
[BL-A]  [BL-B]  [BL-G]  [BL-W]

Buzzer Volume Control

Sometimes our buzzers are too loud.  Snap-on “muffler” reduces the volume by 20 db and anywhere in between just by rotating the slots.

Different Buzzer Tones

Different buzzer tones to audibly identify different units. Hear the different tone types here. [BZ-xx]     $18  

Tone Type
Calibration Certificate

NIST traceable certification in house at Gizmo Engineering. Specification is 0.05% tolerance using the direct comparision method.  Certificate will be shipped with the timer and include actual test results for the timer being calibrated.  This option adds 1 day to shipping times. Certification details.

[CAL-1] $45

Calibration Certificate

NIST traceable certification by Transcat laboratory.  Certified to be withing 0.05% tolerance using the time base method.  Certificate will be shipped with the timer.  Certificates are also available online through our lab’s website.   This option adds 2 weeks to shipping time. Certification details.
[CAL-1] $75