A studio shot of the Klein Tools CL490 digital clamp meter featuring an orange clamp jaw, black body with rubberized grip, rotary dial, function buttons, and dual reverse contrast displays.
The What's Included collection showing the CL490 clamp meter, a black storage pouch with orange trim, a K-type thermocouple, red and black test leads, and two AAA batteries.
A close-up view of the meter interface highlighting the High-Visibility Dual Screens with arrows pointing to the main LCD on the front and the secondary LCD on the bottom.
A professional wearing gloves using the meter to test an electrical panel, displaying a reading of 120.9 on the bright reverse contrast display with text highlighting True RMS Measurement Technology.
A user holding the clamp meter near a wall outlet to demonstrate Non-Contact Voltage Detection, indicated by a red light glowing on the clamp jaw.
An HVAC technician using the meter with the included temperature probe to measure a metal duct, showing a reading of 64 degrees Fahrenheit on both screens.
A studio shot of the Klein Tools CL490 digital clamp meter featuring an orange clamp jaw, black body with rubberized grip, rotary dial, function buttons, and dual reverse contrast displays.
The What's Included collection showing the CL490 clamp meter, a black storage pouch with orange trim, a K-type thermocouple, red and black test leads, and two AAA batteries.
A close-up view of the meter interface highlighting the High-Visibility Dual Screens with arrows pointing to the main LCD on the front and the secondary LCD on the bottom.
A professional wearing gloves using the meter to test an electrical panel, displaying a reading of 120.9 on the bright reverse contrast display with text highlighting True RMS Measurement Technology.
A user holding the clamp meter near a wall outlet to demonstrate Non-Contact Voltage Detection, indicated by a red light glowing on the clamp jaw.
An HVAC technician using the meter with the included temperature probe to measure a metal duct, showing a reading of 64 degrees Fahrenheit on both screens.
KLEIN TOOLS

Klein Tools Clamp Meter CL490 400A AC DC Digital Dual Display True RMS HVAC Multimeter Temperature Probe Non Contact Voltage Tester Tool Kit

In stock
SKU: CL490
$119.99 USD

Description

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Professional-Grade 400A AC/DC True RMS Digital Clamp Meter with Innovative Bottom Secondary Display, Flame Sensor Microamp Diagnostic Module, and Integrated Non-Contact Voltage Detector

The Klein Tools CL490 400A AC DC Digital Clamp Meter Dual Display True RMS Auto Ranging HVAC Multimeter delivers specialized electrical telemetry utility and exceptional circuit tracing accuracy across high-demand residential, commercial, and industrial diagnostic environments. Engineered with a dual-display configuration featuring a primary reverse-contrast screen and a secondary bottom-mounted LCD layout, this high-performance monitoring instrument ensures seamless metric legibility regardless of tool orientation inside cramped enclosure panels. This contractor-grade diagnostic solution resolves hidden line tracing obstacles, dangerous blind voltage path testing, and distorted wave readings by combining True RMS auto-ranging technology with a built-in Non-Contact Voltage (NCV) jaw sensor and an explicit DC microamp validation circuit. Outfitted with a K-Type thermocouple temperature probe connection, a ruggedized 6.6-foot drop-tested structural armor casing, an integrated side-mount lead tracking holder, and comprehensive safety rating protections, this compact diagnostic system optimizes subcontractor field testing throughput during HVAC flame sensor calibration runs, high-current breaker panel audits, and variable-frequency motor line assessments.

Best Used For:

  • HVAC Flame Sensor Auditing: Measuring precise low-current DC microamp circuits within heating systems to diagnose and troubleshoot failing furnace ignition modules.
  • Cramped Panel Inspections: Snapping the wide 1.6-inch jaw opening over thick conductor paths inside tight distribution panels while reading metrics safely from the bottom display.
  • Industrial Variable Circuit Staging: Tracking non-linear current draws, motor controls, and complex solid-state power grids accurately using advanced True RMS calculation matrices.

Key Performance & Safety Features

  • Dual-Display Geometry: Innovative secondary screen on the base allows technicians to monitor high-voltage readouts at awkward angles inside dark junction boxes.
  • True RMS Calculation: Advanced integrated circuit monitors non-linear electrical loads with extreme accuracy, preventing false tracking readings on modern building grids.
  • Non-Contact Voltage Sensing: Integrated jaw inductive sensor provides visual and audible alerts to live AC lines before physical connection leads touch raw wires.
  • Ruggedized Drop Shielding: Reinforced high-impact ABS housing configuration absorbs heavy field impacts, surviving drop failures from up to 6.6 feet.
  • Multi-Meter Capability Matrix: Fully comprehensive measurement suite tracks AC/DC amperage, voltage up to 600V, capacitance, resistance, frequency, and diode limits natively.

What's Included

  • (1) CL490 Auto-Ranging Dual-Display Digital Clamp Meter
  • (1) Set of Right-Angle Premium Input Test Leads
  • (1) K-Type Thermocouple Temperature Sensor Probe
  • (1) Heavy-Duty Protective Storage Pouch
  • (2) Heavy-Duty AA Industrial Batteries
  • (1) Technical Instruction Manual

Technical Specifications

Specification Value
Brand Name Klein Tools
Model Number CL490
Instrument Classification Type Auto-Ranging True RMS Digital Clamp Meter Multimeter
Maximum Current Capacity 400A AC / DC
Maximum Voltage Rating 600V AC / DC Grid Scope
Physical Clamp Jaw Opening 1.6 in.
Display Odometer Screen Style 4000 Count Dual Reverse-Contrast Lit LCD Array
Frequency Logging Span 10Hz - 60kHz Range
Structural Drop Protection 6.6 ft. (2 Meters Structural Rating)
Special Built-In Modes DC Microamps, Non-Contact Voltage Tester, Temperature Probe
Power Cell Configuration 2 x AA Alkaline Batteries
Primary Shell Outer Composition High-Impact Ruggedized ABS Polymer
Net Hardware Tool Weight 13.1 oz.
Overall Body Length Dimension 7.0 in.
Overall Body Width Dimension 3.0 in.
Overall Body Height Dimension 12.0 in.

Pro-Tip: When using the K-Type thermocouple to trace HVAC airflow output temperatures, clean the exposed sensor node with an electrical contact spray before testing alternate ducts. Keeping the probe element free from industrial grease buildup maximizes thermal response speeds and preserves raw temperature data tracking.