The LM Series MCU (microcontroller unit) LCD (liquid crystal display) Hour Meters and Counter are sealed digital instruments designed to monitor and record elapsed running time, normally displayed in hours and tenths of hours. These devices are used to log running time of equipment or counts of equipment use for potential use in transportation applications to assure proper maintenance of expensive machines or systems, as well as warranty claims and rental-use tracking.
- Round with bezel
- Running indicator
- Reverse polarity
- Load dump, inductive, and EMI transient immunity
- Makroblend® case material
- Lexan® lens
- 1/4 in. blade terminals
Product Codes | |
|---|---|
| Mfr Part No: | 70378424 |
Case depth: 1.35 in (including terminals)Digital range hours: 0 to 99,999.9 hours with auto turn overDigital range counts: 0 to 999,999 counts with auto turn overDigital height: 7 mmView angle: 12 o’clockAccuracy: ±200 ppm/hourOperating voltage range: 9 V to 64 V dc/ac (50 Hz to 500 Hz); 50 Hz for counter enableSealing: IP67 (front); IP66 (back)Shock: 55 g per SAE J1378; 75 g per MIL-M-3917DVibration: 20 g per SAE J1378; 10 g per MIL-M-3917DHumidity: 95 % non-condensing at 38 °C [100.4 °F]Operating temperature: -40 °C to 85 °C [-40 °F to 185 °F]Storage temperature: -50 °C to 90 °C [-58 °F to 190 °F]Power consumption: 0.8 mA @ 12 VdcStart time: <1 s; if including all “8†check, then >1 s
- Stock: Warehouse
- Manufacturer Part #: 70378424
Aircraft Fitment Finder
Returns & refund summary
- 30-day return window — with prior return authorization, unopened in original packaging.
- Restocking fee: 20% on unopened items, 30% on open-box items.
- Refund processing fee: 5.51% applies only to customer-remorse returns and customer-initiated cancellations. If a problem is our fault (our cancellation, unavailability, wrong item, confirmed defect, or shipping damage) your refund is 100% with no fees.
- Return shipping: paid by buyer on customer-remorse returns; we pay return shipping when the problem is our fault.
- Non-returnable categories: installed/used parts, special-order or rebuilt items, programmed items (incl. ELTs), batteries, AOG-priority orders, international orders.
Full terms: Return Policy.
Authenticity & authorization
We source products from manufacturers, authorized distributors, and established aviation suppliers as applicable. We are an independent reseller; we do not claim direct dealer or authorized-representative status for any brand. Documentation, source, and warranty eligibility vary by product and are confirmed on request.
See our full Manufacturer Authorizations page for the current per-brand status.
Need traceability paperwork?
If your installation requires FAA Form 8130-3, manufacturer Certificate of Conformance, or other traceability documentation, please call 1-877-722-8727 or email [email protected] before placing the order so we can confirm what is available for this part.
Shipping
Standard ground, expedited, and AOG shipping options are available at checkout. Full shipping-cost tiers and timelines are published on our Delivery Information page.
