EP Calipers

EP Calipers allows you to use electronic calipers to make measurements on images of ECGs or EP recordings. Use time calipers to measure intervals or heart rate, amplitude calipers to measure voltage, and angle calipers for specialized uses such as evaluating Brugada Syndrome. See this post for more details.

EP Calipers is available for iPhone or iPad, Android devices, Mac, and Microsoft Windows™.

Notes on EP Calipers for Windows

There are 3 versions of EP Calipers for Windows available.

EP Calipers for Windows from the Microsoft App Store.
EP Calipers for Windows from FastSpring.
New! EP Calipers for Windows Administrators from FastSpring.

The first two versions are for individual users and can be used on a per user basis on multiple machines on which the user has an account. The third version is intended for IT administrators who work in hospitals or clinics. It allows the program to be installed on a per machine basis so that any user with an account on that machine can use the app. If you are uncertain what the implications of this difference are, it is recommended that you install one of the first two versions.

All versions are identical in function. Updates to the program are free for all versions; however users with the Microsoft App Store version will receive automatic update notices, which is not (at present) possible via FastSpring. Purchasers of the FastSpring versions of EP Calipers will be emailed a coupon for free updates when updates are available.

It is possible to run the FastSpring version on earlier versions of Windows (back to Vista SP2!); however, it is necessary to download the Windows Universal CRT update. Please read the instructions of the linked page carefully to set up your system.

EP Calipers for Windows Licensing

EP Calipers for Windows (Fastspring or Microsoft App Store versions) is licensed on a one copy per one user basis. EP Calipers for Windows Administrators is licensed on a one copy per machine (unlimited users) basis.

Examples

Measure a known interval to calibrate (e.g. 5 “boxes” at 25 mm/sec standard ECG speed which equals 1000 msec)

Calipers maintain calibration with image zoom

Toggle between interval measurements and heart rate

Measure mean intervals and heart rates. Useful for irregular rhythms like atrial fibrillation.

Calculate the QTc using 4 different formulas

Using marching calipers to evaluate complex arrhythmias

Take photos of ECGs or load ECG images from your photo library. You can open PDF files with EP Calipers to analyze figures in published papers.

Other examples

epcalipers-windows-sample2 — Calculating QTc on a Windows PC

Measuring mean rate and interval on a Mac

EP Calipers running on Microsoft Vista using the Universal CRT

YouTube videos

Note: some of these are a bit dated and lack some of the newer features, but they should give you a general idea of how to use the app on different platforms.

EP Calipers for Windows

(Note that this video does not demonstrate the transparent window mode)

EP Calipers on iPad

Angle Calipers

New Features, including transparent window mode

Source code for iOS

Source code for Android

Source code for macOS

Source code for Windows

6 replies on “EP Calipers”

EP caliper transparency is gone after Mojave update

Has been restored in latest version (1.16.1 and above).

it is not caliper QT c
isnot re down apple

Can you clarify your comment?

ep calipers is useless on Mac you can not get the measurements in ms and most of the features are grayed out. It would have been nice to know this before purchasing.

You have to calibrate your caliper with the calibrate button before you can get measurements in ms and make calculations. If this is not the problem please email me at mannd@epstudiossoftware.com.

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