Klein CL460S Clamp Meter Review: Specs and Safety
As an Amazon Associate we earn from qualifying purchases. The person typing klein cl460s wants to know what the Klein CL460S clamp meter measures, what its safety rating allows, and whether its Smart Mode and its 400A range suit the electrical work they do. This review answers those questions from Klein’s CL460S product page, the CL460S instruction manual and Klein’s 2026 clamp meter selection guide. Where those documents do not settle a point, we say so. Because a clamp meter is judged on its current range, its rating and its Smart Mode, the questions below focus on those points and on the limits that decide whether it fits your work.
Quick answer
- The CL460S is a TRMS clamp meter with a 400A AC/DC current range, 600V AC/DC voltage, resistance up to 40 MΩ and a 4000-count backlit LCD.
- Its safety rating is CAT III 600V, Class 2, double insulation, according to the manual, the product page and the selection guide. It is not rated for CAT IV work.
- Smart Mode detects voltage, current, resistance and continuity and switches between them. The manual gives a minimum detectable current of 1.2A in that mode, and 0.3A outside it.
- Choose it for branch-circuit and equipment current checks at 600V or below. If your job is at a service entrance or on CAT IV equipment, choose a meter with a CAT IV rating.
What the Klein CL460S is built to do
The CL460S combines a clamp with a dial and a Smart Mode. Klein’s product page describes it as combining auto-detection with traditional dial control. Smart Mode switches automatically between voltage, current, resistance and continuity without manual selection, and the dial is still there for manual choices. The product page lists 400A AC/DC current capacity, TRMS accuracy and a backlit reverse-contrast display.
The manual describes the meter as having a 3-3/4 digit, 4000-count LCD, and the product page also gives a 4000-count LCD. The product page includes a test lead holder on the back of the meter and magnetic hanger options. Klein lists two hangers, catalog numbers 69445 and 69417, as optional accessories. Those hangers are not included in the meter’s base specification, so check the package contents before you buy if you plan to use one.
Current, voltage and resistance
Current
The manual lists AC current ranges of 40.00A and 400.0A and DC current ranges of 400.0A and related lower ranges. Current accuracy is given as ±(2.0% + 9 digits) on the 400.0A range for AC and DC. The manual states a minimum measurable current of 0.3A for AC or DC. In Smart Mode, the manual gives a minimum detectable current of 1.2A, so small currents need the manual dial setting rather than Smart Mode.
The manual also lists a DC microamp range of 400.0 µA with ±(1.0% + 5 digits) accuracy. Read the manual’s function list before you buy if you need microamp readings.
The clamp is the reason this meter is useful for current. Because you clamp around one conductor, you measure current without opening the circuit. Clamp the jaw around one conductor at a time, and check the reading against the circuit’s expected load.
Voltage
The manual’s AC voltage table runs from 400.0 mV to 40.00V, and its DC voltage table runs from 400.0 mV up to 600V. The maximum input is 600V AC RMS or 600V DC. The input impedance is stated as about 10 MΩ. The manual gives a frequency range of 45 to 400 Hz for the AC voltage function. For DC voltage at the 600V range, the manual gives ±(1.0% + 8 digits) accuracy. In Smart Mode, the minimum detectable voltage is 0.6V, which the manual notes as 600 mV.
Resistance and continuity
The product page gives resistance up to 40 MΩ. The manual lists a 400.0 Ω range with ±(1.2% + 5 digits) accuracy and a maximum input of 600V DC or 600V AC RMS. The manual also includes notes on the conditions in which continuity and resistance readings will not be measured. Read that section before you use the meter on high-resistance circuits.
Frequency and other functions
The product page lists a frequency and duty cycle range of 10 Hz to 60 kHz. The manual’s frequency table gives the same top-end range and an accuracy of ±(0.1% + 5 digits) for frequency. The manual also covers temperature measurement, capacitance, duty cycle and a relative mode. Klein’s selection guide lists the frequency and duty-cycle function for this model, and the product page confirms the range.
Safety rating and what it covers
The CL460S is rated CAT III 600V, Class 2, double insulation. The manual defines CAT III as a measurement category applicable to test and measuring circuits connected to the distribution part of a building’s low-voltage mains installation. Klein’s product page and the 2026 selection guide list the same CAT III 600V rating.
That rating limits where you should use the meter. A CAT III 600V meter suits branch circuits, outlets, lighting, equipment and distribution panels within its voltage rating. It does not suit CAT IV work at the point where power enters the building. The manual’s instructions for test leads say that probes used for mains measurements should meet IEC/EN 61010-031 with a voltage rating of CAT III 600V or better, and that the test lead shield must be pressed firmly in place when working in CAT III locations.
Live mains work can cause serious injury or death. A meter rating does not make an energized panel safe to work on. If the job involves opening a panel, working on a service entrance, or handling equipment you are not trained to handle, hire a licensed electrician.
Power, size and build
The product page has a battery life field that we could not read in the text we opened, so we do not quote a figure. The manual gives an auto power-off of 15 minutes of inactivity in standard mode. The manual lists the meter’s standards as IEC/EN 61010-1 and 61010-2-032, and the product page lists CE certification.
The jaw size of the CL460S is not stated in the page text we opened, so we cannot give a conductor capacity from a verified jaw dimension. Check the jaw size on the product page or the printed manual before you buy if you need to clamp a large cable.
Who the CL460S suits
The CL460S suits an electrician, HVAC technician or serious DIYer who checks current on branch circuits, motors and equipment at 600V or below and who wants voltage, resistance and continuity in the same meter. Smart Mode helps when you switch quickly between checks, and the clamp lets you read current without opening the circuit.
It is a weaker choice if your work needs CAT IV protection, if you need to measure very small currents below 0.3A without dialing the right setting, or if you need the large-current range of a 2000A clamp meter. Compare it with the CL910 for high-current and CAT IV work, or with the CL710 for a CAT IV rating at a lower current range.
Relative and zero functions
The manual lists a DC current zero function and a relative (REL) mode among the functions, alongside the hold, max/min and mode selections. Those functions are useful when you need to offset a reading to a known baseline, or to compare a new reading with a reference value. The manual shows which buttons or dial positions activate them. Because Smart Mode disables the SEL, RANGE and MAX/MIN buttons, use the dial when you need those functions.
Checklist before you buy
- Confirm the CAT III 600V rating against the circuit. The product page, manual and 2026 selection guide all list CAT III 600V and none list CAT IV.
- Check the minimum currents. The manual gives 0.3A for the standard mode and 1.2A for Smart Mode, so small loads need the dial.
- Read the continuity and resistance notes in the manual if you work on high-resistance circuits.
- Decide whether you need a hanger. Klein lists the magnetic hangers (69445 and 69417) as optional accessories.
- Confirm battery life and jaw size from the printed specification before you buy, because we could not read those values in the sources we opened.
Smart Mode or the dial
Smart Mode is the fastest way to move between voltage, current, resistance and continuity, because the meter selects the function for you. The manual, however, shows that some choices stay with the dial. The manual says the dial also switches between degrees Fahrenheit and Celsius, between Hz and percent duty cycle, and between continuity and resistance. If you need a setting that Smart Mode does not provide, or a reading at the lower current limits that Smart Mode does not cover, turn the dial and use the manual’s function descriptions.
Frequency and duty cycle
The frequency function is part of the same Hz/percent switch on the dial. The manual gives an accuracy of ±(0.1% + 5 digits) for frequency and ±1.5% for duty cycle. The product page gives the measurement range as 10 Hz to 60 kHz. That combination is useful for checking a signal or the switching frequency of a drive, but the manual is the place to confirm the input limits and the function you plan to use before you rely on the reading.
How we chose
This review is about one model. We did not rank it against other clamp meters. We limited our sources to Klein’s CL460S product page, the CL460S instruction manual and Klein’s 2026 Clamp Meter Selection Guide. We did not use retailer listings, reseller pages, forums or third-party copies of the manual. Where a document is hard to read, we say so and do not fill the gap with a guess.
What we could not verify
- Battery life. The product page has a battery life field, but the text we opened did not show the figure, so we have not quoted one.
- Jaw size and the maximum conductor it takes. We did not confirm a jaw dimension from the documents we opened.
- The full accuracy table for every function. We quoted only the entries that were clear in the PDF text.
- Whether the optional magnetic hangers are included in your package. Klein lists them as optional.
- Real-world readability of the backlit display, which a document cannot show.
For Klein’s other clamp meters, see our Klein digital clamp meter picks. For Klein’s multimeters, see the Klein Tools multimeter lineup.
FAQ
Is the Klein CL460S CAT IV rated?
No. Klein’s product page, the manual and the 2026 selection guide all list it as CAT III 600V. Do not use it for CAT IV work.
Does the CL460S measure true RMS?
Yes. The product page describes TRMS accuracy and auto-ranging, and the manual describes the meter as TRMS.
What is the maximum current?
The product page and the selection guide list 400A AC/DC. The manual lists a 400.0A range and a 40.00A range for AC current.
What does Smart Mode do?
Smart Mode detects voltage, current, resistance and continuity and switches between them automatically. The manual gives minimum detectable values of 1.2A for current and 0.6V for voltage in that mode.
Can I measure microamps with the CL460S?
The manual lists a DC microamp range of 400.0 µA. Check the function list and the accuracy table in the manual before you rely on it for low-current electronics work.
Does the meter include magnetic hangers?
Klein’s product page lists magnetic hangers (catalog numbers 69445 and 69417) as optional. Check the package contents before you buy.
Bottom line
Buy the Klein CL460S if you need a CAT III 600V clamp meter with 400A AC/DC current, TRMS, Smart Mode and resistance up to 40 MΩ for branch-circuit and equipment work. If your job is at a service entrance or needs CAT IV protection, choose a different meter.
Sources
- Klein Tools, “400A AC/DC Auto-Ranging Smart Digital Clamp Meter – CL460S,” product page. https://www.kleintools.com/catalog/clamp-meters/400a-acdc-auto-ranging-smart-digital-clamp-meter (opened 2026-10-28)
- Klein Tools, CL460S instruction manual (PDF). https://data.kleintools.com/sites/all/product_assets/documents/instructions/klein/CL460S-1390945ART%20-%20WEB.pdf (opened 2026-10-28)
- Klein Tools, 2026 Clamp Meter Selection Guide (PDF). https://data.kleintools.com/sites/all/product_assets/documents/brochures/klein/2026%20Clamp%20Meter%20Selection%20Guide.pdf (opened 2026-10-28)
