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KLEIN TOOLS · Klein Tools CL900 Digital Clamp Meter, 2000A AC/DC Auto Ranging | with TRMS, AC/DC Volt, Current, LoZ, Resistance, Continuity, Frequency, Duty-Cycle, Capacitance, More
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The Klein Tools CL900 is a true-RMS, auto-ranging clamp meter rated by its title to 2000A AC/DC, with a clamp that also does inrush and non-contact voltage and test leads that add voltage, resistance, continuity, frequency, duty cycle, diode and capacitance. The listing states those functions and the LoZ mode plainly. It does not publish an accuracy figure, a jaw opening, a CAT safety rating or a resolution for any range. If you need those numbers before purchase, this listing will not give them to you. Buy it for the function set and the 2000A ceiling, and confirm the omissions with the manufacturer or the box before you rely on it for a safety-critical measurement.
The 2000A figure and the current range it implies
The title says 2000A AC/DC. That is the headline number and the one most buyers will use to decide. It tells you the clamp is built to close around a conductor carrying up to two thousand amps and produce a reading. It does not tell you the resolution at low currents, the accuracy at any point in the range, or whether the 2000A ceiling applies equally to AC and DC. The listing does not publish any of those.
In practice, a clamp with a 2000A top end is aimed at feeders, switchgear and large motor circuits. The same jaw that swallows a big cable is often less precise on a 2A branch circuit, because the sensor has to span a very wide range. That is a general property of wide-range clamps, not a claim about this one. The listing is silent on the low end, so you cannot tell from it how well the CL900 resolves small currents.
If your work is mostly domestic branch circuits and small loads, a 2000A clamp is more range than you need. The guide to choosing a clamp meter explains how to size the range to the job. The CL900’s case is large conductors and high currents, where the ceiling is the point.
LoZ, inrush and NCVT: three functions that change how you work
Low impedance mode, LoZ, loads the circuit under test so that capacitive ghost voltages collapse. Ghost voltages appear on disconnected conductors that run alongside live ones, and they can make a dead circuit look live. A LoZ reading is the honest one. The listing states the mode is there for eliminating ghost voltages, and that is exactly what it does.
Inrush capture is the second useful function. Motors and transformers draw a surge for a few cycles at start-up that a averaging meter will miss or understate. The listing says there is a dedicated mode for capturing inrush current. It does not publish the capture window, the sampling rate or the threshold, so you cannot tell from the listing how short a surge it will catch. Treat the feature as present but unquantified.
Non-contact voltage, NCVT, is built into the clamp. It is a proximity indicator, not a measurement. It tells you a conductor is likely live; it does not tell you the voltage, and it can be fooled by screened cables and strong fields. The listing does not publish a sensitivity range or a CAT rating for the NCVT function. Use it as a first check, then confirm with the test leads.
What the listing does not publish, and why each gap matters
Several numbers a buyer would normally want are absent. This is the core of the review, so they are set out plainly.
| Item | Published? | What the silence means in practice |
|---|---|---|
| Accuracy, any function | No | You cannot judge whether a reading is good enough for a tolerance-based job. The listing says “accurate” and “precise” but gives no figure. |
| Resolution, any range | No | You cannot tell the smallest current or voltage change the display will show. |
| Jaw opening | No | You cannot confirm it will close around your largest conductor or busbar. |
| CAT safety rating | No | You cannot match it to a supply category from the listing alone. See what a CAT rating means. |
| Display counts | No | You cannot tell how many digits the LCD shows or whether it has a bar graph. |
| Battery type and life | No | You cannot plan consumables from the listing. |
| Weight and dimensions | No | You cannot judge how it hangs on a belt or fits a bag. |
| Inrush capture window | No | You cannot tell how short a start-up surge it will record. |
None of these gaps makes the meter bad. They make the listing incomplete. If any of them is decisive for your work, ask the manufacturer or read the box before you buy. Do not assume a figure from a similar model; that is how people end up trusting a number that was never published.
The test-lead functions and the TRMS claim
Through the test leads the CL900 measures AC and DC voltage, resistance, continuity, frequency and duty cycle, diode test and capacitance. That is a full multimeter function set bolted onto a clamp. The listing states it clearly, and it is the reason the meter can replace two tools on many calls.
The listing also states True Root Mean Squared, TRMS, technology. TRMS matters on distorted waveforms: variable-speed drives, switch-mode supplies and anything with a non-sinusoidal current. An averaging meter misreads those, a TRMS meter does not. The listing gives the technology but, again, no accuracy figure to go with it. TRMS tells you the method; it does not tell you the tolerance.
Auto-ranging is stated. It means the meter picks the range for you, which speeds up work and reduces the chance of an off-scale reading. The listing does not publish how many ranges each function has. For a deeper treatment of how these functions are used on the job, see how to measure current with a clamp meter.
Hands-free use, the magnetic hanger and the lead holder
The listing mentions a test lead holder on the side of the clamp and an optional magnetic hanger, Cat. Nos. 69445 or 69417. The hanger is not included; it is an accessory you buy separately. That matters because hands-free operation is often the difference between a safe measurement and an awkward one, especially when you are alone in a panel.
The lead holder is a small feature with a real effect: it keeps the test leads out of the way when you are using the clamp, so they do not dangle into live parts. The listing does not publish the lead length or the probe type supplied, so you cannot tell from it whether the leads are long enough for your reach or rated for the category you work in.
The backlit LCD is stated. It helps in low light, which is most electrical rooms. The listing does not publish contrast, digits or whether the backlight is timed. Those are details you notice in use, not in a listing.
Where the CL900 stops being the right answer
The CL900 is a general-purpose clamp meter with a high current ceiling. It is not a power quality analyser. It will not log, it will not show harmonics, and it will not record over time. If that is the job, a recorder such as the ETCR8430 is the right class of instrument, and the CL900 is not a substitute.
It is also not a dedicated solar or PV tester. The listing does not publish a DC accuracy figure or a CAT rating, both of which matter on PV strings. If PV is your main work, read the solar clamp meter guide before deciding. The CL900 may still be useful as a second meter, but the listing does not give you the numbers to justify it as the primary.
And it is not an alarm. It has no audible threshold or trip function in the listing. It displays a reading; it does not warn you when a value is exceeded. For continuous monitoring, a meter is the wrong tool.
Should you buy the CL900 on this listing?
Buy it if you need a 2000A AC/DC clamp with inrush, LoZ and a full test-lead function set, and you are willing to confirm the unpublished accuracy, jaw size and CAT rating before you rely on it. Do not buy it on the strength of the listing alone if your work depends on a tolerance figure or a safety category. The listing is honest about what the meter does and silent about how well it does it. That silence is the decision you have to close.
Recommended Tools
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Frequently Asked Questions
Does the CL900 measure DC current as well as AC?
Yes. The title states 2000A AC/DC, and the first bullet states AC/DC current via the clamp. The listing does not publish separate accuracy figures for AC and DC, so you cannot tell from it whether one is more precise than the other.
What is the accuracy of the CL900?
The listing does not publish an accuracy figure for any function. It uses the words accurate and precise but gives no percentage or digit count. If accuracy is decisive for your work, ask the manufacturer for the specification before buying.
Is the magnetic hanger included?
No. The listing describes it as optional and names Cat. Nos. 69445 or 69417. You buy it separately. The test lead holder on the side of the clamp is part of the meter.
Can the CL900 replace a multimeter?
For many measurements, yes. Through the test leads it does AC and DC voltage, resistance, continuity, frequency and duty cycle, diode test and capacitance. The listing does not publish the resolution or accuracy on those ranges, so check those figures if you need them.
What CAT rating does it have?
The listing does not publish a CAT rating. That is a significant omission for anyone working on distribution panels. Confirm the rating with the manufacturer or on the meter itself before using it on a supply category where a rating is required.
Will it capture motor start-up current?
The listing states a dedicated inrush mode. It does not publish the capture window or sampling rate, so you cannot tell from the listing how short a surge it will record. Treat the feature as present but unquantified.
Affiliate disclosure: Akermin earns a commission from qualifying Amazon purchases made through links on this page. Our editorial picks are based on documented specifications and owner feedback, not commissions.
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