ENM Vibration Activated LCD Hourmeter - Extreme Conditions

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Part# 10-05277
MFR Model# T56C1


ENMs series T56 LCD Vibration Activated Hour Meter. The hour meter features 6-digits with an hour glass icon as a running indicator. This unit operates only when it is introduced to vibrating equipment.

This meter can be installed anywhere on equipment with no special wiring connection or power source to operate. The internal battery supplies all the necessary power for the gauge to operate for years of service. The total operating hours are always shown on the LCD display.

This compact tamper proof meter is 100% encapsulated with potting compound enabling it to operate in even the most extreme conditions.


  • No External Power Source Required
  • Available with 2 alert maintenances
  • Totally sealed IP67, even works underwater
  • Vibration Activated Detection System
  • Internal Lithium battery provides a display that is always on
  • Vibration: SAE J1378, 20G
  • Shock: SAE J1378, 55G
  • Humidity: SAE J1378, 95% RH
  • Quartz Crystal Accuracy
  • Made in the U.S.A
  • ROHS Compliant


  • Display Reading: 6-Digits 99,999.9 Hours
  • Digit Height: .196 or [5mm] height (Available in 7mm)
  • Accuracy: Better than 0.01% over entire range
  • Temperature: Standard -25C to +70C (-13F to +158F)
  • Battery Life: Internal Lithium Battery 8 years plus, non‑replaceable
  • Vibration Resistance:: SAE J1378, 20G
  • Mounting Configuration: Fits all standard panel opening. See reverse side for detail



have had the ENM unit installed about 9 years. The battery final died. I have mine mounted with adel clamps on the motor mount of my I J-5. I have a friend that his is mounted on the instrument panel of his Champ. Both installations work great. I only have about 200 hours on the J-5 so I will mount ENM on a small fan and let it run for a couple of weeks to get the hours on the new unit back to 200. It is a simple effective device.

Dan R
August 24, 2020

The hour meter works well I would have given it a 5 rating, except for the length of the wire. I connect a toggle switch in the wire, to assure that the hour meter only records when the engine is running and not when another vibration occurs. The wire on the back is so short that it is going to be problematic to install a toggle switch. The first ENM vibration activated hour meter I ordered several years ago had a longer wire and allowed for much easier installation of a toggle switch in the line.

Mark B
January 25, 2021

It took quite a while (about two weeks) but the return of the item in exchange for a new one was good.

David N
September 2, 2019

Lasted for almost two years then the battery died.

June 5, 2022

The internal battery is supposed to last 8 years (as marketed in the description), the hobbs meter died after about a year and a half. We were told the item only has a warranty for 1 year despite the claims made about its longevity. Dont waste your money.

September 28, 2021

Lasted 1.5 years then died.

September 14, 2021

Did not work. Clip the wire loop on the back to activate, is what it says. Did that. Cable-tied to the airframe. Over an hour on the airframe since then and the meter is still zeroed.

March 24, 2021

T56C1 7/2019 Installed in APR2020 and it stopped at 345.5 in JUN2021. Fine print on data sheet says one year warranty. Obviously their battery life is limited.

Gerald R
September 17, 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: Will this start running if the aircraft is re-positioned but not flown?

This meter is based off of vibrations. If the vibrations caused by moving the aircraft are great enough to simulate engine vibration then yes, the hour meter will begin running.

Q: Does the ENM vibration activated LCD hour meter require wiring through the firewall, or is it wireless?

No wiring is required.

Q: Might be good to state it has a wire loop on back that must be cut to be operational, but a switch can be placed in this wire loop so that when the switch is closed, the meter is non-operational, so it will not run when parked outside or moved around.

Thank you for providing this information, we will post it for other customers.

Q: Is this ENM Hourmeter (hobbs) 100% self contained?

Yes that is correct.

Q: Is this approved for certified aircraft or only experimental?

This is for experimental aircraft only.

Q: Is there a way to set the meter to the existing time on the engine? Can we have it shipped with our current number of hours already registering?

This model cannot be set to existing time. We do offer part # 10-07370 which can be set. However, please keep in mind part # 10-07370 is not vibration activated.

Q: Can the battery be replaced on the unit after it dies?

Per Vendor: "Sorry, no. These units have potting compound sealing them for environmental protection making the battery non-replaceable."

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