Great tool and economical

La précision semble assez bonne quand je compare les mesures faites à comparer à ma pince Amprobe AMP-220. Requière l'utilisation d'un multimètre avec une résolution d'au moins 0.1 mV DC pour avoir une lecture de faibles courants. La mâchoire est assez épaisse alors peut être difficile à utiliser dans des espaces restreints. La qualité des matériaux, des boutons et de la fabrication est assez bonne pour cette gamme de prix et la prise en mains n’est pas si mal. Le câble en boudin est très souple et s’étire bien jusqu’à au moins 8 pieds. Il n’y a pas de mise en arrêt automatique alors il ne faut pas oublier d’arrêter l’appareil pour ne pas décharger la pile après usage. Petit désagrément, il faut retirer complètement la vis du couvercle du compartiment de la pile pour retirer ce couvercle et la pile 9V n’est pas incluse. L’appareil vient avec un bel étui en similicuir pour le rangement et un livret d’instructions en anglais bien détaillé. Vraiment un bon achat pour le prix demandé par contre ce n’est pas un outil pour une utilisation professionnelle.

This is a nice affordable option to measure high current with your multimeter.I use a Fluke 87 and this adds one more useful feature. Just make sure to set your meter to mA. If you have your clamp set to DC be sure to zero it with the zero button before taking your measurements.Clamp needs a 9v battery. Not included.Overall a good clamp to add to your kit

This is a great amp clamp for 28.00 bucks. It has far exceeded my expectations for the price. It does work with my Picoscope oscilloscope and captured a beautiful relative compression waveform on my Ram 1500 truck. I would recommend this amp clamp.

I got this because I didn't want to change blown fuses on my new multimeter. The DC accuracy is very good! I'm impressed. The AC readings did not match with my old clamp meter. My main use for this is for DC circuits and as such it is a good purchase for my purposes.

I bought this low-cost clamp-on ammeter figuring it would be -eh- just okay - to replace an old B&K unit.It has two sensitivities, 1 mV/A and 10 mV/A, which, with the maximum output of 400 mV, translates to 400A and 40A full scale, respectively. On the higher sensitivity setting, it had mA resolution with a high-quality DVM, which I already had. So it is not necessary to re-configure the DVM to measure current directly, and that removes the risk of blowing _yet another_ $5 fast-acting HRC fuse. That means it is sensitive enough enough for most electronics work, except for sub-milliamp or microamp circuits which always require dedicated bench top meters. And for household and light-industrial use, a 10x AC line splitter is a perfect complement for similar sensitivity reasons.The unit is the magnetic clamp, with its internal amplifier, and needs a DVM to get the reading. That isn't the drawback it might seem: 1 Many of us already have a DVM, often better than the one in the integrated clamp-ons. And if a meter is needed, the user has the flexibility to choose one is best-suited to the application, 2 It's less expensive that most clamp-ons with built-in DVMs, while offering better utility.and 3 It permits the display to be placed a few feet away from the clamp, which makes it easier to get a clear view. Don't be deceived! — most pictures of integrated clamp-ons can subtly fool you showing the meter up-front and center. In my experience that's rarely the case. Often, the wire needing to be measured is in a tangled mess of stiff copper wires way, in the back of a panel box.Because this unit can also measure direct current, I was most interested to learn how to zero the reading from the Hall effect sensor. The old B&K has a thumb-adjusted flat rotary wheel which is so fussy to set that it takes one hand to make the adjustment, and another to hold the clamp. And maybe a third to hold the DVM. But this product has a simple push-button auto-zero that can be operated with the thumb of the same hand holding the clamp. The auto-zero is not perfect, it left an offset equivalent to ~ 0.8 mA on my sample, still good enough for my needs.The reading drifted a bit, even when the clamp was still. I did not evaluate it in detail because it was low enough, and slow enough, to allow a typical measurement with little affect on a reading. It would also take a complex set of test equipment to be able differentiate between electronic drift and variation caused by change in magnetic fields, for which I wasn't equipped.The reading is sensitive to orientation and movement of the clamp relative to earth's magnetic field, or other nearby magnetic fields, such as from a transformer. That seems to be just the nature of the beast, and the effect can be minimized by zeroing the meter in-situ, already clamped on the wire. That eliminates changes that could be caused by moving the clamp for the reading.One area for improvement is the AC/DC button, which has weak tactile feedback and limited movement. I found it necessary to inspect the switch, sometimes operating it a few times to make sure it was in the right mode. The zero function button doesn't have that issue.In summary, I was surprised and impressed. It was much more useful than I expected, especially for the price. I immediately ordered one for my son also who has his own high-end DVM.

I've tested 2 of these units now.I thought first one was defective, but it had the exact same measurements as the second that came in. Build quality feels ok, light lights up, but it shows no current for AC or DC. I've tested small, moderate, and larger amounts of current (figured a small space heater would be a decent enough larger current test). Doesn't show readings at all. Tried voltage setting 2 multimeters, shows nothing. Tried the dedicated clamp setting on my multimeter, shows no current. Interestingly enough it does show the frequency of the current on my DMM when measuring AC, but that's all I could get. It shows a small response when opening and closing the clamp but nothing while the clamp is on.Disappointed, cannot recommend.

Also buy BOJACK HT30A or similar to connect to your oscilloscope, because this only comes with banana plugs. Works fine for relative testing (like relative compression testing in automobiles). At this price you can expect noise and accuracy issues, but as long as you know that going in, you will get good use of this product. For anyone, this will be an occasional use tool, and smart people will always remove the battery for storage. With a non-caprive screw holding the battery cover on, this is more of a pain than it could be. But again for this price point, it is hard to complain.

Not very sensitive. Might be useful for large amp readings, but other than that, I was really hoping to use it with my scope for smaller mA readings but its just not designed for that.