OTC Tools 3940 Digital Multimeter with Automotive Functions

The OTC Tools 3940 is a professional-grade digital multimeter from the 500 Series, designed for comprehensive electrical diagnostics in automotive and general applications. This versatile meter measures AC/DC voltage, AC/DC current, resistance, capacitance, frequency, and duty cycle, making it an essential tool for technicians and DIY enthusiasts.

Key Features:

• Auto-ranging digital multimeter with large, easy-to-read display
• Measures AC voltage up to 750V and DC voltage up to 1000V
• Current measurement capabilities: 400 microamps to 10 amps (AC/DC)
• Resistance testing from 400 ohms to 40 megohms
• Capacitance measurement range: 40 nanofarads to 4000 microfarads
• Frequency counter: 1 Hz to 10 MHz
• Duty cycle measurement: 0.1% to 99.9% with ±2.5% accuracy
• Diode and continuity testing for circuit diagnostics
• Data hold function freezes readings for easy recording
• Relative change mode for comparative measurements
• Auto power-off feature conserves battery life
• CE approved for safety and quality standards

Accuracy Specifications: AC voltage ±0.8-1.2%, DC voltage ±0.5-0.8%, AC current ±2-2.5%, DC current ±1.5-2%, resistance ±1-2%, capacitance ±3-20%, and frequency ±0.1%.

Dimensions: Compact design measuring 3.5" W x 1.5" D x 7.0" H for portability and easy storage in toolboxes.

This multimeter combines standard electrical testing capabilities with specialized automotive functions like duty cycle measurement, making it ideal for diagnosing sensors, injectors, and other modern vehicle components.