Klein Tools 400A AC/DC TRMS Digital Clamp Meter

The Klein Tools CL390 400A AC/DC TRMS Digital Clamp Meter is a compact, high-performance multimeter designed for accurate measurement of AC/DC current, voltage, resistance, temperature, capacitance, and more. Engineered for professional electricians and HVAC technicians, it offers True RMS technology and advanced features in a rugged, easy-to-use format.

Key Features:

• 400A AC/DC Current Measurement: Precisely measures alternating and direct current through the clamp, ideal for troubleshooting and installations.
• True RMS Accuracy: Ensures accurate readings on non-linear loads commonly found in modern electrical systems.
• Backlit LCD Display: High-visibility screen with dual-line readout and backlight for clear viewing in low-light environments.
• Non-Contact Voltage Detection (NCV): Quickly identify live wires without making direct contact—great for safe first-level diagnostics.
• Thermocouple Input for Temperature Readings: Includes a Type K thermocouple for measuring temperature, essential for HVAC and motor diagnostics.
• Test Lead Storage & Easy Access Battery Compartment: Integrated back panel holds leads neatly, while the battery compartment is accessible without removing the housing.
• Auto Ranging + Manual Mode: Automatically selects the best range or allows for manual override for experienced users.

Measurement Functions:

• AC/DC Current: Up to 400A (via clamp)
• AC/DC Voltage: Up to 600V
• Resistance: Up to 60MΩ
• Capacitance: Up to 4000μF
• Frequency: 10Hz to 500kHz
• Duty Cycle: 1% to 99%
• Temperature: -40°C to 1000°C (via thermocouple)
• Continuity & Diode Test: Audible indicator for continuity and diode verification

Specifications:

• Model: CL390
• Display Count: 6000
• Jaw Opening: 1.18" (30mm) – accommodates conductors up to 750 MCM
• Safety Rating: CAT III 600V
• Battery: 2 × AAA (included)
• Backlight: Yes
• Dimensions: 8.35" x 2.60" x 1.44" (212mm x 66mm x 36.5mm)
• Weight: 0.54 lbs (245g)

Included Accessories:

• Test Leads
• Type K Thermocouple
• Carrying Pouch
• 2 × AAA Batteries
• User Manual

Applications:

• Electrical Maintenance & Troubleshooting: Ideal for electricians working on panels, circuits, and motors.
• HVAC Diagnostics: Accurately measures temperature, voltage, and current in air conditioning systems.
• General Facility Maintenance: Versatile enough for residential, commercial, and industrial applications.
• Safety & Compliance Testing: Non-contact voltage and continuity testing for quick safety checks.

The Klein Tools CL390 400A TRMS Clamp Meter is a feature-rich, reliable tool designed for professionals who need accurate readings and practical functionality in the field. Whether you're working in electrical maintenance or HVAC service, it's a compact powerhouse that delivers on performance and safety.