Handheld Digital Oscilloscope Kit - 2.4" TFT Display, S1MSa/s Sampling Rate, 5mV-20V/div Sensitivity with BNC-Clip Probe & 9V Battery Clip, Portable Audio Tester

This is a handy little scope. It doesn't do everything, of course, but it's a lot easier to carry around that a full-sized scope. It came with a small user guide, which I keep with it as a reminder of how to get to some of the settings.The scope works well on a 9V battery, using a cable available elsewhere on Amazon (9V Battery Clip with 2.1 x 5.5 mm Male DC Power Plug).

I bought this to see if my subwoofer was clipping and well let's say it definitely did the trick. Now I can listen to my sub hit and not worry if I'm going to blow the voice coil or the speaker blow or brun the amp up. Also it's cheap so definitely worth it. Maybe even help your homie and make it so his subs hit as well. Also I just watched a video of a guy that checked if his speaker was clipping and followed his steps so it's definitely easy to use for sure.

This "scope" is functional and cute. Of course it doesn't have the multitude of features and high frequency capability of a real scope. But it is good for every day uses and would also make a great gift to an aspiring STEM person.I did not rate it five stars because: (a) its maximum voltage is 50v and (b) the rubber surrounding of the alligator clips are too large and slippery -- one needs to hands to open the clip (you'' see what I mean).You can see in my picture that I ordered a 9v battery clip so I can use this w/o being near an outlet.

Use this to set up my four channel and Bass amp for tuning work flawlessly.

Absolute junk. Will not turn on. Now I have to return this peace of junk. I'm out time and money as I needed this for repair work. Im extremely disappointed I have to return this. More of my time and money lost purchasing this. I will never by anything from Amazon again. Definitely going with eBay from now on. I should not have to use my money to return a defective item. Total scam and poor customer service on Amazons part.

Slow delivery but nice connector kit

If you install your own car audio this product is invaluable. it really must have to set the gains on your amplifier. I mean for 30 something of dollars and you're not risking blowing your speakers well worth the money. You can find videos on YouTube on how to use this product.

Absolutely love these and MADE IN THE USA! I have bought two packages plus an extra refill for the 10ga yellow ones over the past year. These work fantastic and will give you the best, professional, weatherproof seal.I use them on everything from trailers, to old trucks, to boats, etc. I bought a nice quality butane lighter to stick in the box and it is a nice portable kit to throw in your toolbox. Doesn't take up too much space either.