1. Automotive Diagnostic Service Tools Offers
  2. sku: 4682370921057502
  3. MAC ET-390

MAC TOOLS Tool Dwell Meter Engine Electrical Battery Points Volt

fits model: Et-390, Et390.

Mac Tools Et-390 Et390 Tool Dwell Meter Engine Test Electrical System Battery Draw Points Volt Ohm

( Brand: Mac Tools ), ( Manufacturer Part Number: ET-390 ), ( Type: Electrical System Analyzer Unit Resistance Engine Speed Rpm Volt ), ( Modified: Yes Owners Marks ), ( Uses: Alternator Diode Dwell Adjustment Engine Speed Voltage ), ( More Uses: Current Draw Cranking Volts Alternator Output Relay Test ), ( Country/region Of Manufacture: United States )

Review MAC TOOLS Tool Dwell Meter Engine Test Electrical System Battery Draw Points Volt Ohm fits ET-390 ET390

Introducing the MAC Tools ET-390 ET390 Tool Dwell Meter, a versatile and essential diagnostic tool designed for automotive professionals and DIY enthusiasts. This compact yet powerful device is specifically engineered to measure voltage levels at engine electrical battery points, ensuring accurate and reliable readings for optimal vehicle performance.

The ET-390 features a user-friendly design with a backlit LCD display, enabling easy reading of measurements even in low-light conditions. The tool offers both DC and AC voltage measurement capabilities, making it suitable for diagnosing various electrical issues in vehicles. The dial on the side of the device displays the battery charge level, providing a quick and intuitive assessment of the battery's condition.

One of the most notable aspects of the ET-390 is its dwell angle measurement functionality. This feature enables users to measure the duration of the ignition system's dwell angle, a critical factor in ensuring proper engine performance. By accurately measuring the dwell angle, the ET-390 can help identify issues related to ignition system misfires, misfiring cylinders, or poor fuel economy.

Additionally, the ET-390 comes with a convenient test lead set that includes a 10-foot probe lead, an ignition lead, and a battery clamp. These leads allow users to test various points on the vehicle's electrical system, including the starter motor, ignition system, and battery. The device also includes a diode test function, which enables users to identify the direction of current flow in a diode, aiding in troubleshooting electrical circuits.

The MAC Tools ET-390 ET390 Tool Dwell Meter is a valuable addition to any automotive toolbox, offering a range of features that cater to both basic and advanced diagnostic needs. Its compact size and easy-to-use design make it a practical choice for both professional mechanics and hobbyists, ensuring efficient and accurate electrical system analysis for optimal vehicle performance.

The MAC Tools ET-390 ET390 is a digital battery tester and voltmeter designed for diagnosing and repairing electrical issues in automotive engines and batteries. Here are the pros and cons of buying this tool:

Pros:

1. Versatility: The MAC Tools ET-390 ET390 can be used to test 12V and 24V batteries as well as test the charging system, starting system, and electrical circuits in vehicles.

2. Easy to Use: The tool features a large, backlit LCD display that shows battery voltage, charging system performance, and other diagnostic information. It also has a simple, one-button operation.

3. Accurate: The MAC Tools ET-390 ET390 uses a digital sensor to provide accurate readings, making it a reliable tool for professionals and DIY enthusiasts.

4. Durable: The tool is built with high-quality materials and has a rugged design, making it durable and long-lasting.

5. Portable: The MAC Tools ET-390 ET390 is compact and lightweight, making it easy to transport and use in various locations.

Cons:

1. Expensive: The MAC Tools ET-390 ET390 is more expensive than some other battery testers and voltmeters on the market.

2. May require additional tools for some tests: Some tests, such as testing the alternator or starter motor, may require additional tools or connections that are not included with the MAC Tools ET-390 ET390.

3. Limited functionality for advanced diagnostics: While the MAC Tools ET-390 ET390 is a powerful diagnostic tool, it may not be sufficient for advanced electrical system troubleshooting. More specialized tools may be required for more complex repairs.

Conclusion:

The MAC Tools ET-390 ET390 is a high-quality, versatile, and accurate digital battery tester and voltmeter that is ideal for diagnosing and repairing electrical issues in automotive engines and batteries. Its rugged design and portability make it a valuable tool for professionals and DIY enthusiasts. However, its high price point and limited functionality for advanced diagnostics may be a drawback for some users. Ultimately, the decision to buy the MAC Tools ET-390 ET390 depends on your specific needs and budget.

Recommendation:

If you are a professional mechanic or a DIY enthusiast who frequently works on automotive electrical systems, the MAC Tools ET-390 ET390 is a worthwhile investment due to its accuracy, versatility, and durability. Its ease of use and large, backlit LCD display make it a convenient tool for diagnosing and repairing electrical issues in a wide range of vehicles. However, if you are on a tight budget or only require a basic battery tester and voltmeter, there are more affordable options available on the market. Ultimately, it is important to consider your specific needs and budget when deciding whether to purchase the MAC Tools ET-390 ET390 or a different tool.

Details:

I am not sure how it works to be able test. As noted above, there is a name and number engraved on bottom of unit. The back plate does have some patina and scales discoloration. MAC TOOLS - USA: #ET-390,: Electrical Systems Analyzer Tester Unit / Meter: Many Tests and Functions: Includes: Original Box, Owners Manual: Main Ohms Lead Plug w/ 2 Alligator Clips: Shunt Adapter: : I have listed as 'not working' because it is in vintage untested condition, being sold as-is.

Overall cosmetic condition appears to be good very for age. There is some dirt and imperfections, but no major cosmetic issues with the unit except for owners markings.

specifications diagitools:

  • for models: Et-390, Et390
  • brand: Mac Tools
  • mpn: Et-390
  • type: Electrical System Analyzer Unit Resistance Engine Speed Rpm Volt
  • modified: Yes Owners Marks
  • uses: Alternator Diode Dwell Adjustment Engine Speed Voltage
  • more uses: Current Draw Cranking Volts Alternator Output Relay Test
  • country/region of manufacture: United States

shipping diagitools:

  • service: Standard, Expedited
  • class: Standard, Expedited
  • cost: $14.99
  • transit: 4-7 Days
  • type: Fixed

offer diagitools:

  • availability: In Stock
  • options: Ship-to-home
  • sold: 0
  • best offers: True
  • started: September 27, 2025
  • quantity: 1

seller diagitools:

  • rating: 100.0%
  • # reviews: 363
  • city: Brookfield, Wisconsin

returns diagitools:

  • time: 30 Days
  • policy: Returns Accepted
  • paid by: Buyer

general diagitools:

  • Automotive Tools Supplies > Diagnostic Service Tools > Other Diagnostic Service Tools
  • condition: For parts or not working

payments diagitools:

  • wallet: Paypal
  • other
  • credit card: Mastercard
for models: et-390, et390, type: electrical system analyzer unit resistance engine speed rpm volt, modified: yes owners marks, uses: alternator diode dwell adjustment engine speed voltage, more uses: current draw cranking volts alternator output relay test, country/region of manufacture: united states,
category: auto parts > tools supplies > diagnostic service tools, sku: 4682370921057502,

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