Klein Cl2000
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Klein CL2000 Clamp Meter: What It Measures and How to Use It Safely
The Klein CL2000 is a 400 A AC and DC clamp meter with a true RMS mode, a backlit display, a built-in work light in the jaw and a non-contact voltage tester. Klein’s own US page says the product is no longer in production, while the UK page lists it as available to buy. This guide explains what the CL2000 is built to read, how to take a current reading step by step, what the published specs leave out, and what to confirm before you buy a used or new unit.
Quick answer
The CL2000 clamps around one conductor to read AC or DC current up to 400 A. Its non-contact tester and lead functions cover voltage checks, but the sources we opened do not publish a full voltage range. Confirm the current availability with Klein before buying.
What the CL2000 is built to measure
A clamp meter reads current by sensing the magnetic field around one conductor, so you do not have to break the circuit. The CL2000 is listed on Klein’s US and UK pages as measuring both AC and DC current up to 400 amps. That DC capability is the main difference from many basic AC clamps, and it matters on battery systems, solar strings and automotive work, where DC current is common.
The meter is also described as a true RMS instrument. True RMS means the meter calculates the heating value of a waveform rather than assuming a pure sine wave. The page does not explain which waveforms it handles best, so treat the true RMS label as a feature to confirm in the manual rather than a guaranteed accuracy claim for every load.
Features listed by Klein and the retailer
Klein’s pages list a backlit display, an analog bar graph and a built-in work light at the clamp opening. The magnetic mount and lead storage are meant for hands free use, for example when the meter sits on a metal panel while you read a second instrument. The product page also lists capacitance measurement, which Klein presents as useful for HVAC work, and a non-contact voltage tester built into the unit.
The jaw is listed at 1.25 inches, or 32 mm. The overall size is listed as 8.875 inches high and 3.375 inches wide, which is 225 mm by 86 mm. The UK page gives a weight of 0.67 lb. The retailer page we opened lists the included items as a case, test leads and batteries. The Klein US page lists optional replacement test lead sets, a line splitter and carrying cases.
Safety rating and what it means for use
Both Klein pages show a CAT III 600 V rating. A category rating tells you where on an installation the meter is designed to be used and how much transient overvoltage it can withstand. CAT III is typically associated with distribution and fixed installation circuits. It is not a promise that the meter is safe on every high energy source, and it does not replace the need to check the circuit first.
Before you clamp anything, check the category of the work. Do not use a CAT III rated meter on a source that exceeds its rating, and do not assume a higher number on a different product applies to this one. If you are unsure, stop and get advice from a qualified person.
How to take a current reading with the CL2000
The steps below follow the general sequence in Klein’s warnings and standard clamp meter practice. The full English manual, which Klein links from the product page, should be read before first use. We did not open that PDF, so use this list as a guide rather than the official procedure.
Step 1: Verify the meter on a known source
Klein’s pages show a general warning to verify meter operation by measuring a known voltage or current before each use. On a safe, known source, confirm that the display responds and that the value makes sense. If the meter does not respond, do not rely on it for the job.
Step 2: Choose AC or DC and the range
Select AC or DC current according to the source. A battery or solar string usually calls for DC, and a motor or fixed AC load usually calls for AC. If you do not know the expected current, start on the highest range and step down, so you do not overload the meter.
Step 3: Clamp around a single conductor
Open the jaw and place it around one insulated conductor. Clamping a supply and return pair together cancels the field, and the reading will be close to zero even though current is flowing. Close the jaw fully, keep your fingers behind the guard and watch the display for a steady value.
Step 4: Read and record the value
Wait for the reading to settle. On a motor, the value may spike at startup and then fall to a steady running current. Write down the value with its unit and the function selected, so you can compare later readings against the same setup.
Step 5: Use the leads for voltage checks
Voltage and resistance checks use the test leads rather than the clamp. Keep your hands behind the probe guards, and do not measure resistance or continuity on live circuits, which is a general warning on Klein’s pages for its meters. The non-contact tester is a separate feature. It is useful for locating a live conductor, but it is not a replacement for a lead based voltage measurement.
Where the published information is incomplete
The CL2000 pages do not give a voltage measurement range, a resistance range or an accuracy table. Klein’s US page refers to the manual for those details. One third party search result described a voltage range and a resistance range, but we did not open a page that confirmed those numbers, so this guide does not repeat them.
The availability information also conflicts. Klein’s US page says the product is no longer in production, while Klein’s UK page shows a buy option and does not mention discontinuation. A retailer page we opened does not state a status. Before you buy, check with Klein or your supplier which version you are being offered, and check whether a replacement model is recommended.
Buying a used or new CL2000
When you compare a new unit with a used one, check the total cost. Batteries, replacement test leads and a case may not be included, depending on the seller. A used unit should show every display segment, a clean jaw that closes flat and intact leads. Ask whether the work light and the non-contact tester still respond, since those are listed features and easy to test on site.
If you mainly need AC current on a fixed installation, a simpler clamp may be enough. If you regularly read DC current on batteries or solar strings, the DC function is the reason to consider the CL2000 over a basic AC clamp. Our guides on clamp meters explain the differences in more detail.
What we could not verify
We opened three readable sources: Klein’s US product page, Klein’s UK product page and a retailer listing on homelectrical.com. We did not open the full English manual, because the links we followed did not return readable text. As a result, we cannot confirm the voltage range, the resistance range, the accuracy figures or the exact true RMS method from the manufacturer’s own document.
We did not test a unit, so we cannot check the work light, the non-contact tester or the current readings on a physical meter. We also did not confirm current prices or stock levels.
How we chose these sources
We started with Klein’s own US and UK product pages, because they carry the manufacturer’s feature list and safety rating. We added a retailer page as a third independent reference for the physical details and included items. We did not use search snippets as sources, and we skipped any page that returned an access error during our checks.
FAQ
Can the CL2000 measure DC current?
Yes. Klein’s US and UK pages both list AC and DC current up to 400 A for this meter.
Is the CL2000 still available?
Klein’s US page says it is no longer in production, but the UK page shows a buy option. Check with Klein or your supplier before you rely on a new unit.
Does it measure voltage?
The meter includes a non-contact voltage tester and lead based voltage functions. The sources we opened do not publish a full voltage range, so confirm the figures in the manual.
What is the safety rating?
Both Klein pages list CAT III 600 V. Use the rating only for work that falls within that category.
What should I check on a used CL2000?
Check the display, the jaw closure, the lead condition, the work light and the non-contact tester. Ask whether the case and batteries are included.
Sources
- Klein Tools, CL2000 product page (US): https://www.kleintools.com/product/CL2000 (opened 2026-10-29)
- Klein Tools, CL2000 product page (UK): https://www.kleintools.co.uk/product/CL2000 (opened 2026-10-29)
- Homelectrical, Klein Tools KLT-CL2000 listing: https://www.homelectrical.com/specialty-measuring-tool/klein-tools-klt-cl2000.1.html (opened 2026-10-29)
For background on how voltage testers differ from meters, read How Do Voltage Testers Work? Plain Explanation. For clamp styles and what to look for, see AC DC Current Clamp Meter.
