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Knightware released an update to SQM Reader Pro 3 on 11 Oct 2022.

See Knightware's calendar of events.

SQM Reader Pro

The only software like it anywhere!

SQM Reader Pro 3 for Windows gives you the tools you need to get the most from your Sky Quality Meter model LE, LU, LU-DL or LR. From initial setup of the meter, to nightly data collection, to enabling sophisticated statistical analysis, SQM Reader Pro 3 makes understanding the light pollution in your evening dark sky easy, accurate and convenient.

Experienced users: click here to see new features in version 3.

SQM Reader Pro 3 uses your computer's Ethernet connection to read dark sky data from the model LE, a USB port from models LU and LU-DL, and a 9-pin serial port from the model LR. You can read dark sky data from the model LE over a network or use an Ethernet crossover cable to read it directly. You can read dark sky data from models LU, LU-DL and LR directly via the appropriate cable. SQM Reader Pro 3 does not calibrate the Sky Quality Meter or alter its accuracy.

If you are an imager, a serious deep-sky observer, or you are conducting a dark sky study, SQM Reader Pro 3 is for you. Click to see who is using SQM Reader Pro.


Key Features

For more information, please consult the feature comparison matrix below, or consult the SQM Reader Pro 3 User's Manual (2.6 MB, PDF format )


Skyglow Standard

The Skyglow Standard file format was defined in 2012 by an international group of light pollution researchers, including Knightware. The standard file format allows researchers to exchange darkness measurements regardless of their research interests. The format is supported in SQM Reader Pro 3. You can read the international standard definition here or you can read some background information at the Skyglow Standard web page at International Dark-Sky Association.

sqm reader pro download

available now by digital delivery and CD

Purchase Now

Click the Order Now button below to order SQM Reader Pro securely using express checkout. You may also purchase any of our products securely using the full checkout by visiting the Knightware Store.

Both checkout procedures allow you to pay with major credit cards, debit cards, Paypal and more.

SQM Reader Pro software has a 30 day money back guarantee.
(See policies.)


buy SQM Reader Pro

Feature Comparison Matrix


Feature SQM Reader 3

SQM Reader
Pro 3

Reads SQM-LE, LU, LU-DL and LR on-demand or automatically check check
Displays reading in mag/sq arcsec (MPSAS) & naked-eye limiting magnitude (NELM) check check
Displays date & time of reading check check
Ships with multiple skins and displays properly on high resolution monitors check check
Stores reading to CSV file (SQM Reader native format) check check
Stores readings in Skyglow Standard format (see Skyglow Standard)   check
Opens and processes stored readings files (CSV, Skyglow and Unihedron Device Manager formats)   check
Supports time set, reading and erasing logged readings in SQM-LU-DL   check
Aligns automatic reading to the hour and multiples of the reading interval   check
Suspends automatic reading during twilight and/or sun up   check
Suspends automatic reading during moon up   check
Displays moon phase and altitude at time of reading   check
Displays MPSAS and NELM graphs of readings in real-time   check
Time-averages readings   check
Shows min, max, mean and standard deviation of readings   check
Stores graphs as JPEG   check
Stores reading as JPEG   check
Sends data or JPEG files to a remote FTP server   check
Sends data or JPEG files to a program, script or batch file   check
Sends data to Knightware's SQM Readings Map page.   check
Sends data to the Globe at Night Monitoring Network   check
Includes online Help and examples   check

Hardware and software requirements:

You need the following hardware and operating system software to run the product:

Sky Quality Meters are available from Unihedron or any of its dealers worldwide.

SQM Reader Pro is protected by United States copyright laws and international treaties. All copyrights are owned by Knightware, LLC and/or Phyllis K. Lang, and are registered with the United States Copyright Office.

SQM Reader Pro is a trademark of Knightware, LLC.