A direct front studio shot of the Klein Tools CL445 HVAC clamp meter. The professional-grade orange and black device features a 600A AC current jaw with an integrated non-contact voltage tester, a large backlit digital LCD, a multi-function rotary dial, and dedicated buttons for data hold, max/min, and the integrated worklight.
A technical infographic for the CL445 HVAC clamp meter highlighting its primary features. Text callouts identify the 600A AC current measurement, inrush current capture, DC microamp mode for flame sensors, and simultaneous voltage and amperage display. Technical icons confirm a 2-meter drop protection and CAT IV 600V safety rating.
A detailed view of the CL445 dual-display backlit LCD screen. The high-contrast display is shown monitoring a live circuit, simultaneously displaying a real-time reading of 10.51 Amps and 119.8 Volts, illustrating the tool's advanced multi-measurement capabilities for HVAC diagnostics.
An angled perspective shot of the CL445 digital clamp meter against a white background. The image showcases the ergonomic side trigger for the 1.25-inch jaw opening, the high-visibility industrial housing, and the tactile function buttons designed for one-handed operation.
A technical marketing graphic listing the contents of the CL445 HVAC meter kit. The image identifies the inclusion of the clamp meter, right-angle input test leads, push-on alligator clips, a K-type thermocouple for temperature measurements, three AAA batteries, and a professional storage pouch.
A studio kit shot of the Klein Tools CL445 system. The comprehensive package includes the TRMS digital clamp meter, safety-rated test leads, insulated alligator clips, a temperature probe, batteries, and a heavy-duty black and orange zippered carrying case.
A direct front view of the CL445 tester highlighting the rotary dial positions. The interface shows specialized settings for AC/DC voltage, resistance, continuity, capacitance, frequency, and the HVAC-essential DC microamp mode for testing ignition systems.
A back view of the Klein Tools CL445 highlighting the rugged industrial polymer construction. The image displays the printed safety warnings, the secure screw-down battery compartment, and the magnetic hanger slot used for hands-free diagnostic work.
A side profile of the CL445 clamp meter focusing on the integrated LED worklight located beneath the clamp jaw. The light is shown activated, demonstrating its utility for illuminating dark electrical panels and HVAC equipment during troubleshooting.
An action shot of a technician using the CL445 to measure AC current in a residential furnace. The clamp jaw is shown encircling a live wire while the integrated worklight illuminates the tight enclosure, providing clear visual feedback on the system's amperage draw.
Action shot showing a professional using the CL445 clamp meter to verify voltage at a standard residential outlet. The technician, wearing protective gloves, uses the right-angle test leads to monitor real-time electrical data on the meter's backlit digital display.
Action shot of the CL445 being used to measure temperature in an HVAC duct using the included K-type thermocouple. The digital display provides an accurate thermal reading, showcasing the meter's versatility for environmental control and climate system diagnostics.
The Name on the Tools is Our Reputation promotional how to video
A direct front studio shot of the Klein Tools CL445 HVAC clamp meter. The professional-grade orange and black device features a 600A AC current jaw with an integrated non-contact voltage tester, a large backlit digital LCD, a multi-function rotary dial, and dedicated buttons for data hold, max/min, and the integrated worklight.
A technical infographic for the CL445 HVAC clamp meter highlighting its primary features. Text callouts identify the 600A AC current measurement, inrush current capture, DC microamp mode for flame sensors, and simultaneous voltage and amperage display. Technical icons confirm a 2-meter drop protection and CAT IV 600V safety rating.
A detailed view of the CL445 dual-display backlit LCD screen. The high-contrast display is shown monitoring a live circuit, simultaneously displaying a real-time reading of 10.51 Amps and 119.8 Volts, illustrating the tool's advanced multi-measurement capabilities for HVAC diagnostics.
An angled perspective shot of the CL445 digital clamp meter against a white background. The image showcases the ergonomic side trigger for the 1.25-inch jaw opening, the high-visibility industrial housing, and the tactile function buttons designed for one-handed operation.
A technical marketing graphic listing the contents of the CL445 HVAC meter kit. The image identifies the inclusion of the clamp meter, right-angle input test leads, push-on alligator clips, a K-type thermocouple for temperature measurements, three AAA batteries, and a professional storage pouch.
A studio kit shot of the Klein Tools CL445 system. The comprehensive package includes the TRMS digital clamp meter, safety-rated test leads, insulated alligator clips, a temperature probe, batteries, and a heavy-duty black and orange zippered carrying case.
A direct front view of the CL445 tester highlighting the rotary dial positions. The interface shows specialized settings for AC/DC voltage, resistance, continuity, capacitance, frequency, and the HVAC-essential DC microamp mode for testing ignition systems.
A back view of the Klein Tools CL445 highlighting the rugged industrial polymer construction. The image displays the printed safety warnings, the secure screw-down battery compartment, and the magnetic hanger slot used for hands-free diagnostic work.
A side profile of the CL445 clamp meter focusing on the integrated LED worklight located beneath the clamp jaw. The light is shown activated, demonstrating its utility for illuminating dark electrical panels and HVAC equipment during troubleshooting.
An action shot of a technician using the CL445 to measure AC current in a residential furnace. The clamp jaw is shown encircling a live wire while the integrated worklight illuminates the tight enclosure, providing clear visual feedback on the system's amperage draw.
Action shot showing a professional using the CL445 clamp meter to verify voltage at a standard residential outlet. The technician, wearing protective gloves, uses the right-angle test leads to monitor real-time electrical data on the meter's backlit digital display.
Action shot of the CL445 being used to measure temperature in an HVAC duct using the included K-type thermocouple. The digital display provides an accurate thermal reading, showcasing the meter's versatility for environmental control and climate system diagnostics.
The Name on the Tools is Our Reputation promotional how to video
KLEIN TOOLS

Klein Tools Clamp Meter CL445 HVAC True RMS 600A AC Auto Ranging Digital Multimeter (Voltage DC Microamps Capacitance Temperature NCVT Circuit Diagnostics)

Only 2 left
SKU: CL445
$109.98 USD

Description

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Monitor Current and Voltage Loops Simultaneously to Diagnose Environmental System Inrush Overloads Instantly

The Klein Tools CL445 is an automatically ranging True RMS digital clamp multimeter engineered for the diagnostic measurement of electrical current up to 600A AC and line potential up to 750V AC. This HVAC specialized tester utilizes a unique dual-display mode to present voltage and amperage data sets simultaneously on a single backlit LCD, allowing for real-time monitoring of live system loads. Operating within a certified CAT IV 600V safety envelope, the device integrates a 600µA DC microamps circuit for testing flame sensors alongside a K-Type thermocouple interface to execute environmental climate audits inside unlit mechanical spaces.

Best Used For:

  • Flame Sensor Testing: Hooking directly to furnace control lines to analyze low-current DC microamp steps down to 600µA for fast ionization safety audits.
  • Motor Inrush Analysis: Capturing surge current thresholds during active HVAC compressor start-up sequences to track failing system capacitors.
  • Dual-Vector Power Checks: Measuring operational voltage and active amperage simultaneously on incoming lines to evaluate structural transformer balancing.

Key Performance & Safety Features

  • True RMS Auto-Ranging: Auto-selecting TRMS diagnostic logic filters out harmonic waveform anomalies to deliver precision on complex electronic profiles.
  • Simultaneous Dual Display: Advanced screen framework tracks voltage drops and current parameters together to maximize troubleshooting visibility.
  • Thermocouple Thermal Scans: Integrated K-Type sensor port captures precise ambient, air duct, or component surface temperature metrics from -148°F to 1832°F.
  • Non-Contact Voltage Sensing: Built-in non-contact voltage tracking sensor inside the jaw tip executes quick safety line sweeps before direct lead connection.
  • High-Impact ABS Casing: Ruggedized industrial composite frame protects sensitive solid-state microprocessors against shop drops up to 6.6 feet.

What's Included

  • CL445 HVAC TRMS Clamp Meter
  • Set of Right-Angle Input Test Leads
  • Set of Push-On Alligator Clips
  • K-Type Thermocouple Probes
  • Three AAA Alkaline Batteries
  • Professional Storage Pouch
  • Instruction Manual

Technical Specifications

Maximum Alternating Current: 600A AC
Maximum Monitored Potential: 750V AC / 600V DC
Thermal Monitored Span: -148° to 1832°F
Low-Current DC Step Bounds: 600µA DC
Maximum Circuit Resistance: 60MΩ
Maximum Capacitance Scope: 6.000mF
Clamp Jaw Opening Span: 1.25 in.
Industrial Safety Classification: CAT IV 600V / CAT III 750V
Power Source Requirements: 3 x AAA Batteries (Included)
Tester Chassis Length: 9.24 in.
Tester Chassis Width: 3.77 in.
Tester Chassis Height: 1.59 in.
Net Diagnostic Weight: 13.4 oz.
Pro-Tip: When troubleshooting complex variable frequency motor drives, activate the simultaneous display mode; logging real-time voltage response side-by-side with running amp draw variations isolates high-impedance thermal clipping points instantly.