APRA Altimeter

Perfectflite APRA altimeter

Sales price: $29.95
4 In Stock

The APRA is an entry-level altimeter that doesn’t compromise on accuracy and capability despite its low price. It is small, easy to use, and audibly reports your rocket's peak altitude and maximum velocity after flight via a sequence of beeps.  A post-flight warbling siren sound makes finding small rockets in tall grass easier.


  • Works to 100,000 feet MSL, audibly reports peak altitude and maximum velocity after flight.
  • No mach delay necessary for mach+ flights:  Automatic MachLock assures proper operation with any flight.
  • Uses common type A23 12 volt battery (included).
  • Precision sensor & 24 bit ADC yield superb 0.1% accuracy.
  • Built-in voltmeter reports battery voltage on powerup – no more guessing about battery condition.
  • Post flight locator siren aids in locating your rocket.
  • Pressure sensor is immune to false triggering from exposure to sunlight.
  • Highly resistant to false trigger from wind gusts; tested in 100+ MPH winds!
  • Low power design – battery lasts for over 30 hours.  Post-flight locator siren will run for several days, giving you multiple “second chances” to find a lost rocket.
  • Rugged SMD construction, stringent QC testing, and internal self-diagnostics assure uncompromising reliability.
  • Wide operating temperature range of -40F to +185F.
  • Measures just 2.75"L x 0.55"W x 0.62"H, fits 18mm tube, weighs just 0.56 oz. including battery.
  • Backed by full three year warranty.


  • Power: 4V – 16V, nominal 12V A23 battery
  • Current consumption: 1.5mA
  • Battery life: 30 hours
  • Launch detect: 100' AGL
  • Maximum altitude: 100,000' MSL
  • Altitude resolution: 1' up to 38,000' MSL, < 2' to 52,000' MSL, < 5' to 72,000' MSL
  • Analog to Digital Converter: 24 bit Sigma Delta
  • Calibration accuracy: +/- 0.05% typical
  • Measurement precision: +/- (0.1% reading + 1 foot) typical
  • Sample rate: 20 samples per second
  • Operational temperature: -40C to +85C (-40F to +185F)
  • Dimensions: 2.75"L x 0.55"W x 0.62"H
  • Weight: 0.56 oz. including battery

Additional information