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Note: To measure the current you need to clamp the meter around one of the wires and not the whole power cord. The power cord contains two wires carrying the current and ground wires. The current in two wires always flows in opposite directions, so the magnetic fields from two wires cancel each other, therefore the meter reads 0 A.
Important instruction: The clamp Jaw is only used to measure current. Do not measure voltage by clamping the conductor being measured.
The NCV function can test the voltage without contact. When the Meter senses a weak AC signal, the green indicator light will be on and the buzzer will emit a slow, audible beep. When the Meter senses a strong AC signal, the red indicator light will be on and the buzzer will emit a brief beep.
“For All of Life’s Adventures” is more than a slogan for us; it’s a lifestyle and core philosophy. AstroAI supports the adventurer within and we encourage our customers to take risks and push the envelope.
We don’t choose products based on market interests or fancy analytics. We develop tools and products for ourselves and our customers based on real-world needs and expectations.
AstroAI 4000 Counts TRMS Clamp Meter
The AstroAI True RMS 4000 Counts Digital CLAMP METER is designed to be safely and accurately used by professionals and weekend DIYer’ s. It is suitable for commercial and household electrical problems. Advanced features have been provided including AC/DC Voltage, AC/DC Current, Frequency, Duty Cycle, Resistance, Capacitance Measurement and NCV Detection, Flashlight, Diode, Live Wire Test and Audible Continuity Testing.
Test AC/DC Voltage, AC/DC Current, Resistance, Capacitance etc.
The CM4KOR Clamp Meter can accurately measure AC/DC Voltage, AC/DC Current, Resistance, Capacitance etc.
Frequency and Duty Cycle Test
Turn the rotary dial to the “Hz/%” setting (Duty Cycle Test: Please press the FUNC button to duty cycle test.) The screen will display “ HZ/% ” indicating the measurement function.
Detects Live Wires
Live wire testing with the red test lead. This unique function tests the presence of live wires. When it detects a live wire, the clamp meter will reflect with the audio alarm.
Zero Function
This function helps decrease the data error influenced by the Earth’s magnetic field, and helps you to obtain a more accurate measurement.
NCV Detection
This Clamp Meter features non-contact voltage testing with a sound and light alarm. When the indicator light is on, it means there is voltage, please pay attention to your safety.
Continuity Test
Connect test leads to the circuit, the buzzer inside the Meter will beep if the resistance<50Ω.
Correct Measurement
Please measure in the correct way, otherwise the readings will not be accurate.
Backlit LCD and Flashlight
The Backlit LCD and Flashlight ensure clear measurements in a dimly lit area. The Backlight can be switched manually and shuts off automatically after 15 minutes.
PLEASE ATTENTION
The following incorrect operations may cause the multimeter to show incorrect measurements:
- The conductor to be tested is not in the center of the clamp head. Incorrect current results will occur if the conductor is not placed in the center of the clamp head. （Please refer to the left picture for correct operation）
- Clamp the whole power cord when measuring the current. You need to clamp the meter around one of the wires. The current in two wires always flows in opposite directions, so the magnetic fields from two wires cancel each other, therefore the meter reads 0 A.
- The plugs of test leads are not fully inserted or not inserted into the correct sockets. It will lead to wrong voltage measurement or the clamp meter does not work.
Customer
2025-08-29 10:34:11
Works great, easy to read screen even in bright sunlight, easy to use, decent case.
Tiffany West-Thompson
2025-08-16 18:05:59
Amazing. All the way around. Measurements are accurate. Great value for the money. A must have!
PokerFace
2025-07-16 18:45:28
The unit works well and has many great features. I had had it several months now and it it accurate against my other meters. I took a star off because it is almost impossible to see the display in sunlight. Inside the display looks great. I bought it because my current meter does not have the AMP Inrush function. Unfortunately I take that reading outdoors.
JAFChE
2025-06-27 17:05:23
Works great with a circuit splitter to troubleshoot home electrical devices. Provides reliable readings and also shows when there is power present to insure the power is shut off before doing circuit work on outlets or switches.
Customer
2025-06-22 15:25:40
Hate to only give one star but didn't get a user manual. *Update* seller responded with outstanding customer service and the product works as it should finally found a meter that will help get so many of my electrical issues figured out.
JJHrk
2025-06-15 17:17:14
Does all the many measurements is advertised as doing. Measurements seem accurate. Overall feels solidly made. Dial feels well made. Wires/probes well made with some good end/tip protection. Clamp/jaws feel solidly made. Display is easy to read, with a nice backlight that can be turned on/off. Case/bag well made and fits well.
David
2025-06-10 16:47:19
Overall I've been very pleased. I love the light and the backlit display. The ammeter clamp is very nice, works with both AC and DC. Build quality is pretty good.The only thing that could be better is the leads. The cables are quite stiff, with kinks where the cables were folded when originally packed at the factory. Comparing this to my fluke leads, which are like limp spaghetti, never kinking. The fluke leads also have replaceable ends: either probes or clips.One plus to these Astro leads: they do have a removable shield on the probe so that you can keep the conductive area of the probe to a very small area and reduce the chance of shorting something. That's a nice touch. I just wish they had used a better quality flexible wire.Unfortunately the hole sizes on the AstroAI meter aren't a very good fit for the fluke probes. I can make them work, but the probe connectors are slightly too large for the holes, so I have to force them in.
not4nuthin
2025-05-27 11:34:23
Been using it for few months now and it works just fine. Accuracy is very close to correct, as long as you are not trying to measure very low amps. Satisfied with this purchase.
Lars Helander
2025-05-05 11:29:58
Good multimeter, would have been even better with English printed manual. Now I had to visit some website to get it and print it.Convenient with current measurement in the claw. It differs some from the battery chargers current meter, I wonder which one is correct....
Ivan
2025-04-26 18:39:55
Finalmente un buon prodotto a prezzo contenuto
Günhan
2025-04-15 18:12:13
Oldukça kaliteli görünüyor iyi çalışıyor otorange özelliği çok iyi
Jeff Paquette
2025-02-26 12:25:49
I'm an 15+ years experience automation technician. I bought this for home use because my Fluke T5-600V needs replacement. I'm giving 5 stars because for the price you have a LOT of extra function that are hard to get on other meters (and become overpriced on FLuke's) and so far have found no real fault to it. It is not flimsy nor feel cheap. I've already used the inrush function on ac motor and Dc (12v battery) and it seems to work great. Only been able to compare the AC clamp and it matches what my VFD put out. My work Fluke was actual a little off compared.Only function that didn't work like I thought was the Frequency function. On a VFD, it gives the pulsing frequency of the bus, not the frequency that the motor "feels". On a regular sine wave it gives the right info. Actually thinking of buying one for work instead of my fluke to see if it holds up.
Jorge
2025-02-19 17:22:26
Muchas prestaciones y caracterÃsticas
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