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miniAlt/WD Altimeter

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Replaced by StratoLogger
Shipping Weight:
0.26 LBS

Product Description

This versatile, easy to use altimeter audibly reports your rocket's peak altitude after flight via a sequence of beeps. It can also control the ejection of your parachutes; one at apogee and an optional second larger chute can be deployed at a lower altitude to minimize drift on windy days. The most recent flight curve (altitude vs. time) can be downloaded to your computer using the optional data transfer kit DT3U.

Download the Operation Manual for this product.



  • Precision sensor works to 25,000 feet MSL.
  • Audibly reports peak altitude after flight.
  • Stores over 5 minutes of flight data at 20 samples per second for later download to PC or Mac.
  • In-flight telemetry output for real-time data via your RF link.
  • All data is stored in nonvolatile memory and is preserved even if power is lost.
  • Deploys drogue and main chutes with audible igniter continuity check.
  • Main chute deployment altitude is adjustable from 300’ to 1,700’ in 200’ steps.
  • Mach delay is adjustable from 0 to 14 seconds for high performance flights.
  • Robust power supply is not affected by up to two seconds loss of power in flight.
  • Will fire 10 parallel-redundant ematches even after 24 hours operation on standard 9V battery.
  • High accuracy A/D and precise factory calibration yeilds +/- 0.5% typical accuracy.
  • FLASH program memory for future firmware updates (free of charge to original purchaser.
  • Rugged SMD construction, stringent QC testing, and internal self-diagnostics assure reliability.
  • Measures just 3.0” L * 0.9”W * 0.7”H, fits in 24mm tube, weighs 0.7 oz.
  • Backed by a full three year warranty.
  • Normally powered by a standard 9V battery, use our BH24 or BK24 for 24mm installations.
Advanced features require PC/Mac connect data transfer kit to access:
  • Programmable low battery alarm for different battery types (default 8.4 volt setting for 9V alkaline.
  • Test fire either ematch channel from the computer.
  • Enable/disable optional one second apogee delay for dual-altimeter installations.
  • Enable/disable in-flight telemetry data output.


0.90"W x 3.00" L x 0.75"T
20 grams (without battery)
operating voltage:
9V nominal (6V - 10V)
low battery alarm:
operating current:
8 ma typical
firing current:
27 A peak, 190 mJ energy
cont. check current:
8.9 uA/V
Serial data format:
8 data, no parity, 1 stop, XON/XOFF
Serial data rate:
38,400 bps (commands, data)
9,600 bps (telemetry)
maximum altitude:
25,000 feet MSL
launch detect:
160 feet AGL
event 1 output:
event 2 output:
selectable 300 - 1,700 feet AGL
altitude accuracy:
+/- 0.5% typical
operating temp.:
0C to +70C

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