MATCO TOOLS MD1138 Circuit Tester 12V

( Brand: Matco Tools ), ( Part Type: Circuit Tester ), ( Accessories: Probes ), ( Vehicle Type: Passenger Vehicle ), ( Manufacturer Part Number: MD1138 )

Review MATCO TOOLS 12v Circuit Tester

The Matco Tools MD1138 12V Circuit Tester is a versatile and essential diagnostic tool designed to help automotive professionals and DIY enthusiasts quickly and accurately test 12V circuits in various vehicle systems.

Measuring just 7.5 inches long, 2 inches wide, and 1.5 inches high, this compact tester is easy to carry in your toolbox, making it an indispensable companion for both the shop and the road. Its robust construction is built to withstand the rigors of everyday use, ensuring long-lasting performance.

The MD1138 features a simple and intuitive design with a large, easy-to-read digital display that shows voltage readings in real-time. The tester comes with eight test leads, each color-coded for specific circuit applications, including battery, ignition, and accessory circuits. The test leads are made of high-quality, flexible material for improved reach and durability.

One of the key advantages of the Matco Tools MD1138 is its ability to perform a continuity test, which can help identify open or shorted circuits. The tester beeps when continuity is detected and displays the voltage reading when a good circuit is found. It also has a reverse polarity indicator to prevent damage to the battery or the tester itself.

The MD1138 is powered by two 1.5V AA batteries (not included), ensuring a long battery life. The tester also features an automatic shut-off function to conserve battery power when not in use. Its compact size, versatile functionality, and durability make it an indispensable tool for anyone working on 12V systems in automotive applications.

Matco Tools MD1138 12V Circuit Tester: A Comprehensive Analysis

The Matco Tools MD1138 12V Circuit Tester is a popular choice among professionals and DIY enthusiasts for testing electrical circuits. In this analysis, we will discuss the key features, benefits, and potential drawbacks of this circuit tester.

1. 12V circuit testing capabilities

2. LED indicators for open, short, and ground tests

3. Reverse polarity protection

4. Automatic shut-off for safety

1. Versatile: The MD1138 is suitable for testing 12V circuits, making it an essential tool for diagnosing issues in vehicles, RVs, boats, and other 12V systems.

2. Easy to Use: The LED indicators provide clear visual cues for open, short, and ground tests, making it easy for users to identify electrical faults.

3. Durable: Matco Tools is known for its high-quality, durable tools, and the MD1138 is no exception.

4. Safety Features: The reverse polarity protection and automatic shut-off help prevent damage to the tester and potential electrical hazards.

1. Limited Functionality: The MD1138 is designed specifically for 12V circuit testing. Users requiring testing for other voltage ranges will need to invest in additional tools.

2. Price Point: Compared to some budget circuit testers, the MD1138 is more expensive. However, its durability and advanced features may justify the investment for professionals and serious DIYers.

The Matco Tools MD1138 12V Circuit Tester is a high-quality, reliable tool designed for diagnosing electrical issues in 12V systems. Its clear visual indicators, safety features, and durability make it a valuable investment for professionals and dedicated DIYers. Though it comes with a higher price point, its advanced functionality and robust build may justify the investment.

If you frequently work on 12V systems, the Matco Tools MD1138 12V Circuit Tester is an excellent choice due to its advanced features, durability, and ease of use. For those with a smaller budget or more varied testing needs, other circuit testers with different voltage ranges and functionality may be more suitable.

Details:

Made by Matco Tools, this tester comes with probes to easily check electrical circuits. It provides a convenient and reliable way to test the functionality of electrical systems in vehicle, ensuring accurate diagnosis efficient repair. With the manufacturer part number MD1138, this product is essential for troubleshooting and maintenance tasks in automotive repair. The Matco 12V Circuit Tester is a diagnostic tool specifically designed for passenger vehicles.

part #: md1138 prices

• $15.00-$250.00

specifications electrinquiry:

• brand: Matco Tools
• part type: Circuit Tester
• accessories: Probes
• vehicle type: Passenger Vehicle
• manufacturer part number: MD1138

shipping electrinquiry:

• cost: $11.87
• service: USPS Priority Mail
• carrier: USPS
• transit: 6-12 Days
• class: Expedited
• type: Calculated

seller electrinquiry:

• city: Kennesaw, Georgia
• # reviews: 55
• rating: 100.0%

offer electrinquiry:

• sold: 0
• quantity: 1
• availability: In Stock
• best offers: True
• options: Ship-to-home
• started: February 14, 2026

general electrinquiry:

• condition: Used
• Automotive Tools Supplies > Diagnostic Service Tools > Electrical Testers, Test Leads

payments electrinquiry:

• wallet: Google-pay
• credit card: Diners-club
• other

returns electrinquiry:

• policy: No Returns

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