Draper Automotive Digital Multimeter, 1 x Temperature Probe, 1 x Inductive Clamp

The Draper DMM301 is a professional-grade automotive digital multimeter designed to handle the full breadth of electrical and engine diagnostics in a single, comprehensive kit. Whether you're fault-finding a wiring issue, checking battery health, measuring engine RPM, or monitoring exhaust temperatures, the DMM301 gives you the tools and functions to do it accurately and efficiently.

Featuring both auto and manual ranging, the DMM301 adapts to your working style — auto mode selects the correct range instantly for fast checks, while manual mode gives experienced technicians precise control. The backlit LCD screen ensures clear readings in poor workshop lighting, and the data hold function freezes a reading on screen so you can step back from the vehicle without losing the measurement.

Supplied as a complete diagnostic kit, the DMM301 comes with test leads, a temperature probe, an inductive clamp for non-contact current measurement, two test probes, and a carry case — everything you need, ready to work straight from the box.

Capable of testing AC and DC voltage, AC and DC current, resistance, capacitance, frequency, diode, continuity, temperature, dwell angle, tachometer RPM, and duty ratio, this is one of the most versatile automotive multimeters available at its price point.

Key Features:

• Auto and manual ranging for fast, flexible measurement across all functions
• Tests voltage, current, resistance, capacitance, frequency, diode, temperature, continuity, dwell, RPM, and duty ratio
• Backlit LCD screen for clear readings in low-light conditions
• DWELL function for 4, 6, and 8 cylinder engines
• Tachometer (TACH) function — RPM4: 120–20,000 RPM / RPM2: 60–20,000 RPM
• MAX mode captures and holds peak readings
• Data hold freezes the display for hands-free reading
• Continuity buzzer for fast circuit testing
• Auto power off to preserve battery life
• Temperature measurement from -20°C to 1,000°C (-4°F to 1,832°F)
• Supplied with test leads, temperature probe, inductive clamp, 2 test probes, and carry case
• Requires 1 x PP3 9V battery (not supplied)

Specifications:

A Complete Automotive Diagnostic Kit in One Case

Most multimeters require you to purchase accessories separately. The DMM301 ships as a fully equipped diagnostic kit, with the inductive clamp enabling safe, non-contact current measurement without breaking a circuit — invaluable for checking alternator output, starter draw, and parasitic drain. The temperature probe extends the tool's capability further still, letting you monitor coolant temperatures, HVAC output, and component heat levels up to 1,000°C alongside your electrical measurements.

Advanced Engine Diagnostics with DWELL and TACH

The DMM301 goes well beyond the capabilities of a standard multimeter with dedicated automotive functions built in. The DWELL function measures ignition dwell angle across 4, 6, and 8 cylinder engines — essential for tuning older distributor-based ignition systems. The TACH function measures engine RPM directly from the ignition signal, covering a wide range from idle speed right up to 20,000 RPM, making it useful for everything from diesel vans to high-revving petrol engines.

Who Is the Draper DMM301 For?

The DMM301 is designed for automotive technicians, auto-electricians, and serious home mechanics who need a single multimeter capable of covering the full range of vehicle electrical diagnostics. It is equally well suited to general electrical trades work — HVAC engineers, electricians, and maintenance technicians will benefit from the wide voltage, current, resistance, and capacitance ranges alongside the temperature probe capability.

FAQ Section:

What is included with the Draper DMM301? The DMM301 is supplied as a complete kit including test leads, a temperature probe, an inductive clamp for non-contact current measurement, two test probes, and a hard carry case. A PP3 9V battery is required but not included.

Can the Draper DMM301 measure engine RPM? Yes. The DMM301 includes a dedicated TACH (tachometer) function that measures engine RPM directly from the ignition signal. It covers RPM4 (120–20,000 RPM) and RPM2 (60–20,000 RPM) modes.

What is the DWELL function on the DMM301? Dwell angle measurement is used to check the period during which the ignition points or ignition module hold the coil circuit closed in distributor-based ignition systems. The DMM301 supports dwell measurement for 4, 6, and 8 cylinder engines.

What temperature range does the DMM301 temperature probe cover? The included temperature probe measures from -20°C to 1,000°C (-4°F to 1,832°F), making it suitable for diagnosing heating and cooling systems, monitoring engine components, and checking HVAC performance.

What does the inductive clamp do? The inductive clamp measures current by clamping around a wire and detecting its magnetic field — without needing to break the circuit or make direct contact. This is particularly useful for measuring alternator output, starter motor draw, and identifying parasitic battery drain.

Does the DMM301 have auto ranging? Yes. The DMM301 features both auto and manual ranging. In auto mode, the meter selects the correct measurement range automatically. Manual mode allows you to lock a specific range for more controlled testing.