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.

Q: Does this meter measure both AC and DC current?
A: Yes, the CL390 accurately measures both AC and DC current using the clamp.

Q: Is it suitable for HVAC use?
A: Absolutely—it includes a thermocouple for temperature measurement, making it ideal for HVAC technicians.

Q: Can the meter fit around large wires?
A: The 1.18" jaw opening can accommodate wires up to 750 MCM, suitable for most applications.

Q: What safety rating does it have?
A: The meter is CAT III 600V rated, making it safe for distribution-level measurements.

All products must be installed by a licensed electrican. DIY electrical work is illegal and very dangerous.

Change of Mind
All products purchased from MJS Electrical Products & Supplies are backed by a thirty (30) day Peace of Mind Return Policy. All products returned must be in perfect unused condition, with all components, complete with original packaging. We will not allow returns on damaged or incomplete products. Proof of purchase is required. Should the product not be in original condition, please contact us before returning it as this may save you some unnecessary costs.

Damaged / Faulty Goods
If you find that the goods were damaged in transit or were faulty in some manner, please contact us within 24 hours of receiving the goods. We will organise for the return of the goods and arrange a credit towards your next purchase or send a replacement product. Customer will incur the cost of return postage and be credited the purchase price only. We recommend that you return your unwanted items using registered post or trackable courier. We can not be held responsible if returned items are lost in transit.

Warranties
Product warranties are governed by the respective manufacturers and / or suppliers warranty terms and conditions (available on request). We will not be liable to you or any third party for any loss suffered due to product failure. We will process product warranty claims through the respective manufacturers and/or suppliers. All warranties are void if the product is not installed by a licensed electrician.

PRODUCT INFO
SKU KTCL390
Model # CL390
Barcode # 092644692871
Brand Klein Tools
SHIPPING INFO
Shipping Weight 0.5700kg
Shipping Width 0.070m
Shipping Height 0.140m
Shipping Length 0.290m