AstroAI CM4K0R Digital Clamp Meter, 4000 Counts, TRMS with NCV

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Product guide

AstroAI CM4K0R Digital Clamp Meter, 4000 Counts, TRMS with NCV

Counts: AstroAI CM4K0R is a 4000-count digital clamp meter with TRMS and non-contact voltage detection. It combines clamp-based current checks with test-lead measurements for a range of electrical tests, plus a backlit display and flashlight for dim work areas.

At a glance

The clamp measures current around an individual conductor without opening or interrupting the circuit.
Test leads are used for voltage and other multimeter measurements. The jaw is for current measurement only.
NCV detection signals sensed AC with sound and light indicators.
Data Hold, Max/Min, continuity buzzer, backlight and flashlight support routine troubleshooting.

Price

$43.99Save 40%

Reference price: ~~$72.99~~

Price checked: Nov 12, 2026

View offer Ahead of Black FridayExplore the selection

Often bought together

AstroAI Digital Multimeter, TRMS 6000 Counts, Auto-Ranging, DM6000AR Blue | AC/DC Voltage, Current, Resistance, Capacitance, Continuity, Frequency, Temperature, Duty Cycle, Backlit LCD, Data Hold

$39.99

Neoteck 25PCS Automotive Back Probe Test Leads Kit | 15PCS Back Probe Pins + 5PCS Banana Plug to Alligator Clip + 5 PCS Alligator Clips for Multimeter Diagnosis Circuit Testing

$27.50

Pros and cons

Pros

Combines clamp current measurement with test-lead multimeter functions including voltage, resistance, capacitance and frequency.
Backlit LCD and flashlight are useful in poorly lit work areas.
The stated kit includes test leads, a storage bag and a user manual.

Technical specifications

17 specifications

Identity
Brand	AstroAI
Model	CM4K0R
Measurement type	Multimeter
Display count	4000 counts

Measurement and ratings
Measurement functions	Measures AC/DC Current & Voltage, Resistance, Capacitance, Frequency, Continuity, Diode, Live Wire Test
TRMS	TRMS
Non-contact voltage testing	Non-contact voltage testing with sound and light alarms
Overvoltage category	Overvoltage category III 600V
Power configuration	AC/DC

Power and battery
Batteries required	2 AAA batteries required.
Battery inclusion claim	1.5V AAA Batteries x 2 Included

Dimensions and installation
Dimensions listed	6.9 x 2.8 x 19.6 centimetres
Weight listed	Approx. 205g

Functions and controls
Additional functions	Data Hold, Max/Min, Auto power off after 15 minutes inactivity, low battery indicator and continuity buzzer
Range selection	Auto and Manual
Display and work lighting	LCD Backlit Screen and Flashlight
Zero function	ZERO function decreases the data error influenced by the Earth’s magnetic field, and helps you to obtain a more accurate measurement.

What to know before buying

For clamp current readings, clamp around one wire, centre it in the jaw and do not clamp the whole power cord. Use the test leads for voltage measurements and select the appropriate mode.

Listing details to confirm

Listing details are inconsistent or unconfirmed: dimensions are given as both 6.9 x 2.8 x 19.6 centimetres and 195x68x29mm, and weight as both 399 g and Approx. 205g. The listing also gives both a 3 ¾ display description and 4000-count style. Battery requirements are stated as 2 AAA batteries required, while another specification says two AAA batteries are included. Confirm the selected listing details before purchase.

What’s in the box

Clamp multimeterIncluded
Test leadsIncluded
Storage bagIncluded
User manualIncluded
2 AAA batteriesCheck selected pack

Check which accessories are included in your selected pack before buying.

Who is it for?

A good fit for

Home or general electrical troubleshooting where clamp current readings and test-lead measurements are both useful.
Buyers who want NCV alerts and a backlit display with a work light for dim areas.

Less suited to

Buyers who need a clearly reconciled dimension, weight or battery-inclusion specification before purchase.
Work requiring measurements beyond the stated CAT III 600V rating.

AstroAI CM4K0R Digital Clamp Meter, 4000 Counts, TRMS with NCV · photo 2 — Additional product photo 2

Customer reviews on Amazon

4.4 / 5 · 3,253 ratings

5 stars69%69%
4 stars18%18%
3 stars5%5%
2 stars3%3%
1 star5%5%

Customer feedback is generally positive about accuracy, usefulness and perceived value, with durability described as mixed. That may matter for frequent or demanding use. The meter's listed functions cover varied electrical checks, but feedback does not establish measurement performance or long-term reliability.

Positive themes

Customers report positive impressions of accuracy and value for money.
Customers describe the feature set and functionality positively.

Mixed feedback

Customer feedback on durability is mixed.

Frequently asked questions

Can the clamp jaw measure voltage?

No. The listing says the jaw is for current measurement only. Use the test leads for voltage measurements.

What does the NCV function do?

It provides non-contact voltage sensing with sound and light alarms. The listing describes different light and beep behaviour for weak and strong AC signals.

What comes in the package?

The manufacturer contents list names the clamp multimeter, test leads, storage bag and user manual. Battery inclusion is inconsistent in the listing, so confirm it with the selected offer.

What should I know about its dimensions and weight?

The listing provides conflicting dimensions and weights. See the listing-details note and confirm the specific configuration before buying.