Klein Tools Clamp Meter CL390 400A AC DC Auto Ranging Multimeter (True RMS Reverse Contrast LCD DC Microamps Temperature NCVT Solar Diagnostic Tool)

Audit Solar Panel Array Branches and Verify Flame Ionization Safety Components with Precision Non Contact Voltage Interrogations

The Klein Tools CL390 is an automatically ranging True RMS digital clamp multimeter engineered for the direct measurement of electrical current up to 400A AC/DC and line potential up to 600V AC/DC. This field test instrument incorporates a high-visibility backlit reverse contrast LCD screen to ensure clear readability under high-glare direct sunlight or unlit basement mechanical rooms. Operating within a certified CAT III 600V safety envelope, the device integrates an interior jaw-mounted non-contact voltage sensor alongside a 200µA DC microamps circuit to execute flame sensor diagnostics and solar array troubleshooting loops.

Best Used For:

• Solar Array Troubleshooting: Measuring active DC current parameters up to 400A directly on alternative energy generation paths and inverter distribution frames.
• Flame Sensor Diagnostics: Verifying furnace micro-amp signaling down to 200µA DC to troubleshoot intermittent heating system ignition interruptions.
• Climate Network Balancing: Recording component thermal profiles up to 1832°F using the included K-Type thermocouple to audit heat transfer differentials.

Key Performance & Safety Features

• True RMS Auto-Ranging: Auto-selecting TRMS diagnostic logic filters out variable waveform distortions to preserve metric reading stability.
• Reverse Contrast LCD Display: High-definition dark matrix screen delivers clear numerical tracking visibility inside tight, poorly lit structural panels.
• Jaw-Embedded Safety Tester: Non-contact voltage module positioned inside the 1.6-inch clamp assembly runs quick circuit validation checks before probe placement.
• Integrated Diagnostic Framework: Offers automated sub-modes tracking capacitance up to 4000µF, frequency parameters, and circuit resistance paths up to 40MΩ.
• Rugged Double Insulation: Hardened impact-resistant framework case passes field concrete floor deck drop validation testing up to 6.6 feet.

What's Included

• CL390 AC/DC Digital Clamp Meter
• Set of Test Leads with CAT III/CAT IV Safety Caps
• K-Type Thermocouple Probe
• Three AAA Alkaline Batteries
• Soft Professional Carrying Case
• Instruction Manual

Technical Specifications

Pro-Tip: When troubleshooting complex automated DC battery banks or solar networks, use the integrated side lead storage track; this keeps your diagnostic probes managed safely while operating the 1.6-inch spring jaw assembly with a single hand.