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O.a.t. (outside Air Temperature) Gauge/Displays Fahrenheit, Celsius and Voltage, LED with automatic dimming, 14V - 28V input, temperature range: -40 degrees to 199 degrees Fahrenheit and -40 degrees to 100 degrees Celsius, 2 1/4 clock mount. Includes temp

O.a.t. (outside Air Temperature) Gauge/Displays Fahrenheit, Celsius and Voltage, LED with automatic dimming, 14V - 28V input, temperature range: -40 degrees to 199 degrees Fahrenheit and -40 degrees to 100 degrees Celsius, 2 1/4 clock mount. Includes temp
O.a.t. (outside Air Temperature) Gauge/Displays Fahrenheit, Celsius and Voltage, LED with automatic dimming, 14V - 28V input, temperature range: -40 degrees to 199 degrees Fahrenheit and -40 degrees to 100 degrees Celsius, 2 1/4 clock mount. Includes temp
O.A.T. (OUTSIDE AIR TEMPERATURE) GAUGE/Displays Fahrenheit, Celsius and Voltage, LED with automatic dimming, 14V - 28V input, temperature range: -40 degrees to 199 degrees Fahrenheit and -40 degrees to 100 degrees Celsius, 2 1/4 clock mount. Includes temperature probe. 303-2
M303 Series Outside Air Temperature and Voltage Indicator | Round Mount

The M303 Series Indicator is a single push-button instrument with digital display of the three functions: voltage, outside air temperature (Fahrenheit), and outside air temperature (Centigrade).

Version 303-2 has a standard 2-1/4 inch round mount.


  • Calculates outside air temperature in ºF and ºC, voltage
  • Lightweight
  • 2-1/4 inch standard front mount
  • Automatic dimming
  • Miniature remote probe
  • Sunlight readable display
  • Laser engraved face plate
  • FAA-PMA approved

Product Codes

Mfr Part No:303-2
ECCN:7A994
PMA:PQ1062NM
SCHEDULE B CODE:9025100000


Weight: 5 ozDimensions: 2.375 x 2.375 x 3.35 inInput voltage: 14 VC – 28 VDCInput current: 100mA maxOperating temperature: -25ºC to 60ºCVoltage range: 10 to 32 Volts ±0.2 Volts Typ.

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  • Stock: Warehouse
  • Manufacturer Part #: 303-2
$369.47
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Returns & refund summary

  • 30-day return window — with prior return authorization, unopened in original packaging.
  • Restocking fee: 20% on unopened items, 30% on open-box items.
  • Refund processing fee: 5.51% applies to all refunds (returns, cancellations, core-fee refunds) regardless of reason.
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  • Non-returnable categories: installed/used parts, special-order or rebuilt items, programmed items (incl. ELTs), batteries, AOG-priority orders, international orders.

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If your installation requires FAA Form 8130-3, manufacturer Certificate of Conformance, or other traceability documentation, please call 1-877-722-8727 or email [email protected] before placing the order so we can confirm what is available for this part.

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