Differential Pressure Tester With Master Orifice

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Part# 12-02346
MFR Model# 2EM


This Differential Cylinder Pressure Tester combines the features of the popular 2E tester and a Master Orifice into one tool. Now you can conveniently check the calibration of your pressure tester before each use (in accordance with Teledyne Continental Service Bulletin M85-15) without disconnecting the tester.

Comes with complete instructions. Includes hose and spark plug adapter.

Note: For use with engines of 5" Bore Diameter or smaller per AC43.13 REV 1B.
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Works well on my IO-360 engines. Seems accurate and standard. Good deal and decent price.

Skyward V Verified Purchase


January 14, 2022

Very nice unit comes in its own storage box with instructions. Works great.

Chris W
May 28, 2019

The unit itself is fine. But the unit does not come with a calibration certificate *even* if you ask for it. So prepare to send it to your calibration lab when you receive it....

Aero C
August 2, 2021


Please note, Aircraft Spruce'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 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 size spark plug adapter does this differential pressure tester with master orifice come with?

This unit comes standard with an 18mm adapter. It can be special ordered with 12mm or 14mm adapters.

Q: Does this come with a calibration certificate?

No, a calibration certificate is not automatically included. If you require one, please request it at time of order. Be aware that the addition of the certificate may affect processing time.

Q: What size is the Master Orifice ?

The orifice size is .040"

Q: What fittings are on each end of the hose?

The hose has common air compressor style quick release fittings.

Q: What is the part number for the 12mm adapter that would work with this unit?

It is our part number 12-01018.

Q: Does this have a manufacturer calibration label sticked on it? Not necessarily a separate certificate. Thank you.

The calibration cert would need to be requested when the order is placed, one is not included with this tool.

Q: What is the size of the pneumatic fitting on the input side?

It uses a standard air compressor quick release fitting. Itis a 1/4" NPT m-style industrial plug.

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