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Davtron Digital Voltmeter / Outside Air Temperature Model 303

From $249.95 to $265.95
Description Part Number Price Buy
DAVTRON 303-2 ROUND 2 1/4
Subtotal $0.00
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Davtron M303 Features

  • Light weight
  • 2-1/4 standard mount or front mount
  • Automatic dimming
  • Miniature remote probe
  • Sunlight readable displays
  • Outside air temperature (f)
  • Outside air temperature (c)
  • Aircraft voltage with alarm
  • Laser engraved faceplate
  • FAA/PMA Approved

Davtron FAA PMA # PQ1062NM

Download M303 Brochure
California Prop 65 Warning Symbol

WARNING: Cancer and Reproductive Harm -


  • Davtron Inc. recommends that you purchase our products through your local avionics shop and have them do your installation. They know how to handle all the log book entries you need for FAA approval.
  • FAA/PMA Approvals
  • Beech 35, A35, B35, C35, D35, E35, F35, G35, H35, J35, K35, M35, N35, 35-33 and 35-A33.
  • Download FAA 337 Form


  • Temperature range: -40C to +100C
  • -40F to +212F
  • Operating Temp: -25C to + 60C
  • Voltage Range: 10 to 32 Volts +/- 0.2 Volts Typ.
  • LED with automatic dimming
  • Input Voltage: 14 to 28 Volts
  • Input Current: 100 mA max.
  • Weight: 5 ounces
  • Warranty: 1 year


Not 4 specifics screws included

Juan G Verified Purchase

DAVTRON 303-2 ROUND 2 1/4

January 22, 2022

Best location to place probe thru fuselage on a pa28 180?

Joseph P
June 16, 2020

Overall appearance is nice, appears well made. Complaints are - 1) the probe is hard wired to the instrument and about 1/2 in diameter, so hopefully you have the room to run the probe where you need it otherwise you will be cutting and splicing the probe wire. 2) The mounting screws are 4-40 which is fine for a new install but if replacing an existing instrument you will be finding yourself retapping the threads in the gauge to 6-32.

Scott H
November 28, 2019


Please note,'s personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: How long is the wire from the oat probe that comes with Davtron 303-2?

The wire supplied is 12 ft long.