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Radiant Digital Altimeter - Density Altitude With Outside Air Temperature Probe

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Overview

**NOT FAA APPROVED - FOR USE IN EXPERIMENTAL AIRCRAFT ONLY**

RADIANT's Digital Altimeter (RDAL) is built for pilots who want altitude to remain the primary visual focus. Its main dial presents altitude in a clear, conventional round-instrument style, using a short 10,000-foot hand and a long 1,000-foot hand, while the instrument’s right-side data stack adds digital altitude, Kollsman setting, outside air temperature, vertical speed, and density altitude in a compact, easy-to-scan layout. When enabled, the new G-meter also becomes part of the dial rotation.

Rather than acting like a simple one-function altimeter, RDAL provides the builder with a more capable altitude instrument while retaining the familiarity of a dedicated altitude presentation. It is especially attractive when altitude warrants the greatest visual emphasis, but supporting flight data still needs to be readily available in the same instrument.

The updated platform allows practical configuration from the front panel. RDAL supports inHg or hPa Kollsman units, °F or °C temperature display, temperature calibration, and G-meter enable/disable in setup. Kollsman is adjusted directly from the front controls, with a standard-pressure reset available from the panel.

An external temperature probe is included, and RDAL is available in both 2-1/4 inch and 3-1/8 inch versions for flexible installation.

Technical Details

  • Radiant Digital Altimeter (RDAL) with shared 2026 Radiant platform and interface
  • Available in 2-1/4" and 3-1/8" case sizes
  • Analog-style altimeter dial plus digital altitude readout
  • Settable Kollsman window in inHg or hPa
  • Density altitude display
  • Vertical speed display to ±9,999 FPM
  • Outside air temperature with included external probe
  • Built-in G-meter with scrolling strip-chart history
  • Selectable Kollsman units: inHg or hPa
  • Selectable temperature units: °F or °C
  • Temperature calibration from setup menu
  • G-meter can be enabled or disabled in setup
  • Brightness control from front panel
  • Designed for experimental, ultralight, and qualifying Light Sport aircraft
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Reviews

Excellent service, shipped right on time. Altimeter installed easily.

Dan C Verified Purchase

Radiant Digital Altimeter With OAT And Density Altitude 3-1/8 Bezel

February 23, 2026

The altimeter has came in the mail. The quality looks good and I have yet to install it on my ultralight.

Andrew V Verified Purchase

Radiant Digital Altimeter With OAT And Density Altitude 3-1/8 Bezel

October 1, 2025

Q&A

Please note, Aircraft Spruce Canada'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. Aircraft Spruce Canada 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: What is the depth of this unit/series?

Approx 1" to 1-1/8" max with the connector.

Q: For how long is the accuracy guaranteed or expected ?

It shouldn't have to be calibrated more than once per year and the unit carries a full 3 year warranty.

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