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FireFly Altimeter

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Your Price:
$29.95 (You save $5.00)
Shipping Weight:
0.32 LBS
Calculated at checkout
Maximum Purchase:
5 unit(s)

Product Description

The FireFly is a tiny, lightweight altimeter that reports the peak altitude and speed of your rocket's flight.  Its high accuracy, low price, and ease of use make the FireFly ideal for rocketry education programs where precise, repeatable data is required on a limited budget.  Each altimeter is individually calibrated for optimum accuracy, repeatability, and interchangeability.

When used by itself, the Firefly reports altitude and speed by blinks of its onboard green LED (refer to manual below for more details).  For added convenience you may want to consider the optional Firefly Field Data Display which plugs into the Firefly's data connector to retrieve and displays this information on its easy to read LCD display.  Click here for more information: Firefly Field Data Display


Download the User's Manual for this product.


  • Works to 100,000 feet MSL, reports peak altitude and maximum speed after flight.
  • Unlike many other low cost altimeters, each unit is individually calibrated and tested for optimum accuracy, repeatability, and interchangeability.
  • No mach delay necessary for mach+ flights: Automatic MachLock assures proper operation with any flight.
  • Uses common CR1025 lithium battery (included).
  • Low power design – battery lasts for over 30 hours.
  • Precision sensor & 24 bit ADC yield superb 0.1% accuracy.
  • Highly resistant to false trigger from exposure to sunlight and wind gusts; tested in 100+ MPH winds!
  • Wide operating temperature range of +32F to +158F.
  • Measures just 1.1"L x 0.68"W x 0.31"H, fits 18mm BT20 tube, weighs just 0.12 oz. including battery.
  • Rugged SMD construction, stringent QC testing, and internal self-diagnostics assure uncompromising reliability.
  • Backed by full three year warranty.


3V CR1025/CR927 Lithium Cell
Battery life:
30+ Hours (Rayovac CR1025)
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-Digital Converter:
24 bit Sigma Delta
Calibration accuracy:
+/- 0.05% typical
Meas. precision:
+/- (0.1% reading + 1 foot) typical
Operational temp.:
0C to +70C (+32F to +158F)
1.1"L x 0.68"W x 0.31"H
0.12 oz including battery

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