The Klein Tools CL450 is a 600A AC True RMS HVAC clamp meter with dual K-type thermocouple ports for differential temperature measurement, rated CAT IV 600V / CAT III 1000V. The 2-inch jaw fits large conductors. Low Impedance (LoZ) mode eliminates ghost voltages, and a low-pass filter and inrush current mode support HVAC diagnostics. DC microamps measurement at 1 µA resolution enables precise flame sensor testing. A dual backlit 6000-count LCD displays simultaneous readings. Measures voltage up to 1000V AC/DC, resistance, capacitance, and frequency. Suited for HVAC technicians and commercial service work. Covered by Klein Tools' 1-year limited warranty.
Is the CL450 still available?
No — the CL450 has been discontinued.
What made the CL450 stand out?
The CL450 combined 600A True RMS measurement, Low Impedance (LoZ) mode, differential temperature (two thermocouple inputs for supply/return delta-T readings), and a dual display — one of the most capable HVAC-oriented clamp meters in the previous Klein lineup, rated CAT IV 600V / CAT III 1000V.
What current model is closest?
No single current Klein model replicates the CL450's combination of LoZ, dual display, and differential temperature at 600A. The CL800 or CL810 cover LoZ and single thermocouple temperature at 600A; the CL490 covers dual display and temperature at 400A.
# Klein Tools® CL450 HVAC Clamp Meter with Differential Temperature **Model:** `CL450` **Brand:** Klein Tools **Category:** Clamp Meter > The Klein Tools CL450 is a 600A AC True RMS HVAC clamp meter with dual K-type thermocouple ports for differential temperature measurement, rated CAT IV 600V / CAT III 1000V. The 2-inch jaw fits large conductors. Low Impedance (LoZ) mode eliminates ghost voltages, and a low-pass filter and inrush current mode support HVAC diagnostics. DC microamps measurement at 1 µA resolution enables precise flame sensor testing. A dual backlit 6000-count LCD displays simultaneous readings. Measures voltage up to 1000V AC/DC, resistance, capacitance, and frequency. Suited for HVAC technicians and commercial service work. Covered by Klein Tools' 1-year limited warranty. ## Specifications | Attribute | Value | |---|---| | Product Type | Digital Clamp Meter | | Form Factor | hook | | Ac Amp Capacity | 600 | | True Rms | Yes | | Auto Ranging | No | | Temperature Measurement | Yes | | Differential Temperature | Yes | | Low Impedance Loz | Yes | | Worklight | No | | Flexible Clamp | No | | Dual Display | Yes | | Jaw Opening In | 2 | | Voltage Range Ac | 1000V AC | | Voltage Range Dc | 1000V DC | | Frequency Hz | 999.9 kHz | | Cat Rating | CAT IV 600V, CAT III 1000V | | Battery Type | 3 x AAA | | Overall Length In | 10 | | Barcode (UPC) | 092644690631 | | Warranty | 1-year limited | ## What's Included - Carrying Case - Instruction Manual - Straight Input Test Leads - Two K-Type Thermocouples - 3 x AAA Batteries Source: https://www.jaspecs.com/klein-tools/clamp-meter/cl450-klein-tools-electrical-tester-hvac-clamp-meter-differential-temperature/