A complete Klein Tools CL320 HVAC Digital Clamp Meter kit layout featuring the 400A AC TRMS meter, a padded black carrying case with orange trim, high-quality test leads, a K-Type thermocouple probe, and three AAA batteries.
Feature infographic for the CL320 HVAC clamp meter highlighting TRMS measurement technology, 600V AC/DC voltage, 400A AC current, 40M Ohm resistance, and 200 microamp DC range. It also showcases the temperature range of -40 to 1832 degrees Fahrenheit and its CAT III 600V safety rating.
A front-facing view of the Klein Tools CL320 HVAC clamp meter. The image details the orange 400A clamp jaw with integrated NCV sensor, the selection dial for HVAC-specific functions like DC microamps and temperature, and the 4000-count backlit LCD.
Rear view of the CL320 HVAC clamp meter showing the textured ergonomic grip, the secure battery compartment screw, and the back of the orange clamp jaw with safety indicators. The central mounting point for an optional magnetic hanger is also visible.
Profile view of the CL320 HVAC meter emphasizing the side-mounted test lead holder and the spring-loaded clamp trigger. This design facilitates one-handed operation during complex HVAC system troubleshooting.
Perspective shot of the Klein Tools CL320 with professional-grade red and black test leads attached. The auto-ranging meter is ready for measuring capacitance, frequency, and diode health in industrial or residential settings.
An HVAC technician using the CL320 clamp meter to test a furnace unit. The meter is shown measuring 24.78 volts while probing the gas valve and control board components, demonstrating its utility in HVAC diagnostic work.
Action shot of the CL320 clamp jaw in use, looped around a conductor within a heating unit. The technician, wearing a leather safety glove, monitors the backlit display which indicates an accurate measurement of 4.13 Amps.
An HVAC professional troubleshooting a furnace control board using the Klein Tools CL320 and test leads. The meter is shown verifying electrical connections near a yellow gas line, highlighting its specialized application for heating and cooling system repairs.
Klein Tools Clamp Meter Family promotional how to video
A complete Klein Tools CL320 HVAC Digital Clamp Meter kit layout featuring the 400A AC TRMS meter, a padded black carrying case with orange trim, high-quality test leads, a K-Type thermocouple probe, and three AAA batteries.
Feature infographic for the CL320 HVAC clamp meter highlighting TRMS measurement technology, 600V AC/DC voltage, 400A AC current, 40M Ohm resistance, and 200 microamp DC range. It also showcases the temperature range of -40 to 1832 degrees Fahrenheit and its CAT III 600V safety rating.
A front-facing view of the Klein Tools CL320 HVAC clamp meter. The image details the orange 400A clamp jaw with integrated NCV sensor, the selection dial for HVAC-specific functions like DC microamps and temperature, and the 4000-count backlit LCD.
Rear view of the CL320 HVAC clamp meter showing the textured ergonomic grip, the secure battery compartment screw, and the back of the orange clamp jaw with safety indicators. The central mounting point for an optional magnetic hanger is also visible.
Profile view of the CL320 HVAC meter emphasizing the side-mounted test lead holder and the spring-loaded clamp trigger. This design facilitates one-handed operation during complex HVAC system troubleshooting.
Perspective shot of the Klein Tools CL320 with professional-grade red and black test leads attached. The auto-ranging meter is ready for measuring capacitance, frequency, and diode health in industrial or residential settings.
An HVAC technician using the CL320 clamp meter to test a furnace unit. The meter is shown measuring 24.78 volts while probing the gas valve and control board components, demonstrating its utility in HVAC diagnostic work.
Action shot of the CL320 clamp jaw in use, looped around a conductor within a heating unit. The technician, wearing a leather safety glove, monitors the backlit display which indicates an accurate measurement of 4.13 Amps.
An HVAC professional troubleshooting a furnace control board using the Klein Tools CL320 and test leads. The meter is shown verifying electrical connections near a yellow gas line, highlighting its specialized application for heating and cooling system repairs.
Klein Tools Clamp Meter Family promotional how to video
KLEIN TOOLS

Klein Tools Clamp Meter CL320 400A AC Auto Ranging Multimeter (True RMS 600V DC Microamps Temperature Capacitance NCVT HVAC Circuit Diagnostic Tool)

Only 2 left
SKU: CL320
$99.98 USD

Description

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Verify Flame Sensor Continuity And Audit Variable Climate Motors Instantly With Backlit Double Insulated Induction Tracking Loops

The Klein Tools CL320 is an automatically ranging True RMS digital clamp multimeter engineered for the direct measurement of electrical current up to 400A AC and potential up to 600V AC/DC. This HVAC specialized tester incorporates a 200µA DC microamps circuit to evaluate structural furnace flame sensors alongside an integrated K-Type thermocouple port to execute ambient thermal profiling. Operating within a certified CAT III 600V safety envelope, the device employs a 1.6-inch jaw sensor and a high-contrast 4000-count backlit LCD screen to safely capture electrical parameters inside unlit mechanical rooms.

Best Used For:

  • Flame Sensor Testing: Connecting specialized test leads to capture tiny 200µA DC microamp currents to verify heating system ionization safety.
  • Climate Handler Maintenance: Clamping the 1.6-inch induction jaw over blower motor lines to track running alternate current draws under load.
  • Thermal Loop Balancing: Interfacing the included K-Type thermocouple line to measure ductwork and mechanical system profiles up to 1832°F.

Key Performance & Safety Features

  • True RMS Auto-Ranging: Auto-selecting TRMS metric processing filters out background harmonic noise to maintain data accuracy on non-linear loads.
  • Proximity Safety Tester: Non-contact voltage sensor embedded in the clamp jaw performs rapid line verification scans before test lead placement.
  • Illuminated Digital Display: High-visibility 4000-count backlit LCD screen presents clean character sets inside dim crawlspaces and utility vaults.
  • Comprehensive Testing Array: Multi-mode selection tracks loop resistance to 40MΩ, capacitance to 4000µF, frequency sweeps, and diode health.
  • Rugged Impact Defense: Hardened double-insulated Class 2 chassis matrix withstands raw jobsite concrete floor drop impacts from up to 6.6 feet.

What's Included

  • CL320 HVAC TRMS Digital Clamp Meter
  • Set of Test Leads with CAT III/CAT IV Safety Caps
  • K-Type Thermocouple Probe
  • Professional Padded Carrying Case
  • Three AAA Alkaline Batteries
  • User Instruction Manual

Technical Specifications

Maximum Alternating Current: 400A AC
Maximum Monitored Voltage: 600V AC / 600V DC
Thermal Monitored Scale: -40° to 1832°F
Low-Current DC Step Bounds: 200 µA DC
Maximum Internal Resistance: 40 MΩ
Maximum Capacitance Scope: 4000 µF
Monitored Frequency Scale: 10 Hz - 60 kHz
Clamp Jaw Opening Span: 1.6 Inches
Chassis Drop Protection: 6.6 Feet
Industrial Safety Certification: CAT III 600V, Class 2, Double Insulation
Tester Chassis Dimensions: 8.45" L x 3.5" W x 1.5" H
Net Operating Weight: 1.32 lbs.
Pro-Tip: When diagnosing complex multi-stage heating setups, insert the right side test lead directly into the integrated back-mounted probe track; this locks the multimeter point stable to grant clear one-handed terminal board probing.