Content copyright ESN labs 2020

Production of the Phochron has stopped. I am currently sold out. Thank you all for supporting this product...

Phochron ending production

Sorry to say this, but after many years of making the testers, I have decided to end production. There are many reasons, including production cost increases, poor quality materials from China, Covid... It is just not feasible to continue selling the testers. At this time, I am sold out. I will be using up my remaining parts and will have a few more to ship in April.

...eget sapien vitae massa


SLR curtain shutter testing

Use the external sensor module to do extensive tests on curtain shutters.

Calibration Check mode

The calibration check mode is used to verify the accuracy of the sensors

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Simple Shutter testing

Use the built-in sensor for testing all types of shutters

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The only tester available that has an oscilloscope waveform display!

Check out the Youtube Video Page

Download the English language user guide here. For other languages:

Go to Click on the “From” and “To” tabs to select first, what language the original PDF is in (From), and what language you want it translated into (To). Click on “browse“ and then select the PDF file from your computer that you want translated

The basic tester is $135USD, the deluxe version is $155USD. Shipping to the USA is $8 and shipping international ranges from $24 To $35. I accept paypal as a payment option . I have a very limited amount available. Send a note to

New! Introducing the Phochron Test fixture

The test fixture is an ideal way to hold the tester and the light source steady while running shutter tests. It is fully adjustable in height and distance. It is a modular design that allows the user to arrange the components for nearly any camera.

Here’s a few photos of the new test fixture for both simple shutter testing and in use during curtain shutter testing. Click here to for more information.