This is some information about the Z-Log made by www.Hexpertsystems.com

and here is the information that you get from it

Here is the description,

Key Features (click to see complete specifications)

• Onboard display shows altitude information in real-time.
• Tracks maximum altitude - find out how high your aircraft flew!
• Display and record altitude in feet or meters.
• Altitude resolution of 1 foot/meter.
• Record altitude data for later review.
• Configurable data recording rate as fast as 10 samples per second.
• USB PC Interface for configuration and data download, plot, and analysis.
• Onboard controls allow configuration in the field.
• Includes PC software.
• Marks altitude data when triggered from an external signal.
• Exports data in Excel .csv format or as GIF, bitmap or JPEG images.
• Accepts wide range of input power: 3.7 - 15 volts. Power from your aircraft receiver.
• Firmware upgradeable.
• Only 0.28 ounces (8 grams).
• 1.57" x 0.92" x 0.37" (40 mm x 23.4 mm x 9.4 mm).