Draper Expert Auto-Ranging Digital Clamp Meter with Linear Bar Graph Function

The Draper Expert DCM402 is a professional auto-ranging digital clamp meter built for electricians, automotive technicians, HVAC engineers, and industrial maintenance professionals who need accurate, non-contact current measurement alongside a comprehensive suite of electrical test functions — all in a single, well-specified instrument.

At the heart of the DCM402 is its non-contact clamp jaw, with a maximum opening diameter of 36mm, capable of measuring AC and DC current up to 600A without breaking the circuit or interrupting the load. Simply clamp around a single conductor and the meter delivers an immediate, accurate reading — making it ideal for measuring high-current loads on motors, switchgear, distribution boards, and automotive charging systems where direct probe connection would be impractical or unsafe.

Auto and manual ranging across all functions keeps the DCM402 fast and flexible in use. The backlit LCD screen ensures legibility in dimly lit plant rooms, engine bays, and electrical cupboards, while the linear bar graph function provides a continuous visual representation of changing readings — particularly useful for monitoring fluctuating currents or spotting intermittent faults in real time. A built-in inspection light adds a further practical touch, illuminating the work area without needing a separate torch.

Supplied as a complete kit with test leads, a temperature probe covering -50°C to 300°C, and a carry case, the DCM402 is ready for professional use straight from the box.

Key Features:

• Non-contact clamp jaw with 36mm maximum opening diameter — measures up to 600A AC/DC
• Auto and manual ranging across all measurement functions
• Tests AC and DC voltage, AC and DC current, resistance, capacitance, frequency, diode, continuity, duty cycle, and temperature
• Linear bar graph display for real-time visual monitoring of changing values
• Backlit LCD screen for clear readings in low-light environments
• Built-in inspection light for illuminating the work area
• Wide temperature measurement range via included probe: -50°C to 300°C
• Capacitance measurement across 8 ranges up to 99.99mF
• Frequency measurement from 100Hz up to 10MHz
• Auto power off to preserve battery life
• Supplied with test leads, temperature probe, and carry case
• Requires 3 × AAA batteries (not supplied)

Specifications:

Non-Contact Current Measurement Up to 600A

The clamp jaw is the defining feature of the DCM402 and the reason it excels where a standard multimeter falls short. By clamping around a single conductor, the meter detects the magnetic field generated by current flow and converts it into an accurate reading — with no need to disconnect the circuit, interrupt the load, or work with exposed live terminals. The 36mm jaw opening accommodates the majority of single-core cables, bus bars, and conductors found in commercial, industrial, and automotive applications, with measurement capacity up to 600A on both AC and DC circuits.

Linear Bar Graph — Spot Faults a Standard Display Would Miss

The linear bar graph is a feature that experienced test professionals will immediately appreciate. Displayed alongside the numeric reading on the LCD, it provides a continuous, real-time visual representation of the measured value — updating far faster than the digit display can refresh. This makes it significantly easier to detect fluctuating currents, intermittent faults, and live load changes that would otherwise appear as a blur of rapidly changing numbers. For monitoring motor start-up current, checking variable loads, or identifying unstable signals, the bar graph is an invaluable addition.

Who Is the Draper Expert DCM402 For?

The DCM402 is designed for trade and industrial professionals who need more than a basic clamp meter. Its combination of high current range, broad capacitance and frequency measurement, temperature probe, linear bar graph, and built-in inspection light makes it equally well suited to commercial electricians working on distribution systems, HVAC engineers balancing heating and cooling loads, automotive technicians measuring alternator and battery system currents, and maintenance engineers monitoring motors and industrial equipment. The Expert designation reflects a specification level that goes meaningfully beyond entry-level instruments.

FAQ Section:

What is the maximum current the Draper DCM402 can measure? The DCM402 measures AC and DC current up to 600A via its non-contact clamp jaw, with a lower 60A range for more precise measurement of smaller currents.

What is the maximum jaw opening on the DCM402 clamp meter? The clamp jaw opens to a maximum diameter of 36mm, accommodating most single-core cables and conductors used in domestic, commercial, and light industrial electrical installations.

What does the linear bar graph function do? The linear bar graph displays a continuous, rapidly updating visual representation of the measured value alongside the numeric LCD readout. It responds faster than the digit display, making it much easier to observe fluctuating or intermittent readings in real time.

Does the Draper DCM402 measure temperature? Yes. The DCM402 is supplied with a temperature probe capable of measuring from -50°C to 300°C. The meter's temperature range specification extends to 1,000°C, suggesting compatibility with higher-range probes.

What is the difference between a clamp meter and a standard multimeter? A standard multimeter measures current by connecting test leads directly into the circuit in series — requiring the circuit to be broken or the load to be disconnected. A clamp meter measures current non-invasively by clamping around a conductor, making it faster, safer, and practical for high-current measurements that would be difficult or dangerous with direct connection.

What batteries does the Draper DCM402 require? The DCM402 runs on 3 × AAA batteries, which are not included.

What is included with the Draper Expert DCM402? The DCM402 is supplied with test leads, a temperature probe, and a carry case.