MUSTOOL C21 AC/DC Current Voltage Digital Clamp Meter Large Color Screen NCV 6000 Counts True RMS Automatic Measurement Smart Digital Multimeter
Questions and Answers
I’m having issues measuring AC Volts as the program only allows it to be measured in mV. How is this changed to read volts up to 600V as it doesn’t seem to be on the programs?
Tomeasure in AC you have to put the multimeter in auto mode, which is the automatic mode, you can get to it by pressing the set button, which is the same as the power button. Do not try to measure AC in another mode than automatic because you will damage the multimeter
Can you explain "DC Transformer?" IN over 50 years in electronics I have never seen or heard of such a thing. And a clamp on is a transformer that relies on the field around a wire carrying alternating (AC) current.
Hello friends, this product can directly measure DC current, and DC current transformer is not needed to measure the normal current value.The DC current transformer is a transformer used for the conversion of the value of DC current. It utilizes the non-linearity and asymmetry of the core in the core coil when the core is magnetized by DC and AC currents, and through the rectifier circuit, the large DC current passing through the coil is converted into a small DC current in inverse proportion to the number of turns. It is mainly used to measure large DC currents, and is also used as current feedback, control and protection components in rectifier systems.DC current transformer, also called magnetic modulation principle transformer, is a very commonly used DC current transformer. It was successfully developed by Professor Cramar of Germany in 1936. It uses the measured DC to change the The inductive reactance of the core choke coil indirectly changes the current of the auxiliary AC circuit to reflect the magnitude of the measured current.
please let me know what is the difference between C21 and C20 clamp meter , both look similar ?
C20 is a lower model, can not measure direct current
BG101210474 on 23 March 2023
Arrived in 10 days, 3 weeks faster than expected. Item as described, everything in package. It could be better protected. Fast delivery, easy order. Recommend!
jaminjimlp on 02 August 2022
This is a GREAT DEAL... to get all these features with such a low price!!! the only thing I will add is a magnet to the back so I can stick it on something metal to hold while I use it... The flash light is not very bright but that's not why you need this tool... It's a great back up for my UEI G2 Phenix yep it does everything that does and adds True RMS and the auto feature. I measured some new capacitors and it's pretty accurate.
BG493651144 on 08 July 2022
The amperometric clamp looks very good. when in car mode. serves for anyone who may be wrong to put in DC or AC. It's very complete. I recommend it arrive in record time and with a gift
yo2lcq on 24 May 2022
The device arrived in good condition. Packaging ok, 100% integrity. Powering with two AAA batteries instead of a 9V one seems fine to me, compared to other instruments. Maybe it was interesting to use AA batteries instead of AAA for longer use. The device is small, light, has enough facilities and is not pretentious in the pockets for field work. 100% satisfaction.
BG404816390 on 21 March 2022
screwless on 12 March 2022
C21 Digital Clamp meter with a lot of good functions. Included in the box were the Clamp Meter itself, a pair of Positive and Negative probes, a temperature-sensing probe, and an instruction manual in the English language - no other languages are included. It takes 2 AAA batteries (not supplied) with the battery door cover held in place with a single screw. The device itself seems to be well made and is a little heavier than I was expecting. It includes a large, crisp, and clear LCD display that can be easily read during the day, or when in low-light conditions. Included is a small white LED that sits between the two clamps that can be switched on to provide enough light to be able to see what you are doing during low-light conditions. The C21 Clamp meter measures AC Current 400A max (+ or - 2.5%), DC current 400A max (+ or - 2.5%), DC Voltage up to 600V (+ or - 0.5%), AC Voltage up to 600V (+ or - 0.8%), Line on-off test (buzzer sounds when less than 50 ohms), Resistance 600 ohms - 60M ohms (+ or - 0.8%), Diode (resolution 1 V, with accuracy 0.001V, Capacitance 60nF - mF (+ or - 2.5%), Temperature -40 to 1000 degrees C, or -40 to 1832 degrees F (+ or - 1%), Frequency 60Hz - 1000Hz (+ or - 1%). My own testing seems to be within those ranges but can differ depending on where the cable is positioned within the Clamp. For the price, this is a reasonable device and will get you the information you need. Overall, its build quality is excellent and small enough to be transportable. A great addition to a tool bag.
tosla on 03 March 2022
First of all, the probes aren't quality. The item is running two AAA pen batteries. The live end feature is nice. Don't expect good performance from the NCV feature. He ca n't find the sub-plaster cable. I didn't expect it anyway, the screen is big enough and legible. It has a flashlight feature. AC and DC are good with current measurement. I gave the photos an AC current measurement photo, but it's not normally measured like that, I know I just had to do it through phase or neutral. The warning sound and the warning light are pretty strong. Good product for the price. The temperature reading is working well too.
topybear on 19 January 2022
It took a long time to wait because it was pre-order, and then they changed the expected delivery time twice. It's a nice little instrument, surprisingly small for the usual size of the lock trappers. Surprisingly accurate, I expected worse for that kind of money. The logic of the buttons is a little unusual at first - there are usually several buttons on the instrument, three buttons have done everything - but it is quickly used.
sergei_micheev on 18 January 2022
Маленький, удобный прибор. В автоматическом режиме измеряет ток переменки. Постоянку замерял, оказывается, что надо соблюдать полярность( на губке обозначено и + и -).
ciman on 22 December 2021
The perfect thing, all in one. It's just the temperature doesn't show very accurately. Auto-recognition, it takes a bit to record. Battery how to replace is not in the manual, but I finally found the bolt from the cover under the round sticker. When no value is measured, the values fluctuate on the scale, that confused me. Otherwise, I'm happy, there's no competition at the price.
07Osman on 12 December 2021
Hi, great product. Other measurements standard. But, DC Current measurement with clamp true. My review video there https://www.youtube.com/watch?v=-JFCRSSJ4ik