AS9100 Rev D/ISO 9001:2015 Certified
Serving the Aviation Industry since 1973
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M850 Series Digital Chronometer
Two button control system is natural and error free. Setting operations are identical for both alarm and time setting.
Bright sunlight readable incandescent displays.
Illuminated buttons and annunciators for night viewing.
Flight Time recorded in hours and minutes or in hours, tenths, and hundreds.
Serial time data output for remote use.
Flight time alarm with external output.
Elapsed time count down timer with alarm.
A 4 MegaHertz crystal precision time reference.


Click on Part Number to see available options and pricing
P/N Description
M850-5V Digital Chronometer 5V Series
M850-14V Digital Chronometer 14V Series
M850-28V Digital Chronometer 28V Series
M850A-5V Digital Chronometer 5V Series Color Gray
M850A-14V Digital Chronometer 14V Series Color Gray
M850A-28V Digital Chronometer 28V Series Color Gray




M805B Series
  • M850B Features
  • FAA APPROVED
  • 2 1/4" INTERNAL MOUNT OR FRONT MOUNT
  • TWO BUTTON CONTROL SYSTEM
  • GREENWICH MEAN TIME
  • LOCAL TIME
  • FLIGHT TIME WITH ALARM
  • ELAPSED TIME WITH ALARM
  • COUNTDOWN TIMER WITH ALARM
  • OPTION AUDIO ALARM
  • BRIGHT SUNLIGHT READABLE DISPLAY
  • AUTOMATIC DIMMING
  • ILLUMINATED BUTTONS AND ANNUNCIATORS
  • KEEP ALIVE BATTERY OPTION
  • FAA APPROVED


P/N Description
M850B Black Front Mount
M850B-2 Internal Front Mount


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M850
M850B
GMT 24-hr. format
Local Time 12-hr. format, 24-hr. option offered
Flight Time Records in 99:59 standard, 99:99 hour option
Elapsed Time
Count Up
Starts in min., sec. then hrs.; min. up to 99:59 hrs.
Elapsed Time
Count Down
Settable from one second to 59 min., 59 secs.
Elapsed Time Alarm Activates @ 0 when counting down
Incandescent Displays readable in sunlight
Automatic Dimming Yes
Battery Type N size alkaline
Polarizing Filter Yes
Keep Alive Current .00004 Amps
Input Current .2 Amps
Input Voltage 28V (backlight available 5V, 14V, 28V (must specify)
Crystal Reference -40° C to +60° C. 001%
Weight 5 ounces
Warranty 1-year
  • Greenwich Mean Time: 24 hour format
  • Local Time: 12 hour or 24 hour option
  • Flight Time: Records in hours and minutes, up to 99:59, 99.99 hour option
  • Flight Time Alarm: Full set range flight time
  • Elapsed Time Count Up: Starts in minutes and seconds, then hours and minutes, up to 99:59 hours
  • Elapsed Time Countdown: Settable from one second to 59 minutes and 59 seconds
  • Elapsed Time Alarm: Activates at zero when counting down
  • Count Down Timer: Settable from one second to 59 minutes and 59 seconds.
  • LED Displays: Readable in sunlight
  • Automatic Dimming
  • Battery Type: CR2032
  • Keep Alive Current: .00004 amps
  • Input Current: 0.2 Amps
  • Input Voltage: 14 to 28 Volts (backlight available 5V, 14V, or 28V lighting)
  • Black Face Plate: Engraved Nomenclature
  • Grey Face Plate: Silkscreened Nomenclature
  • Weight: 5 ounces
  • Warranty: 1 year