allsunOscilloscope Handheld Scope Digital Storage Meter and Digital Multimeter DMM 25MHz Single Channel, Model:EM125, Black

I bought this scope to view waveforms on RC servo circuits and CNC equipment circuits. Nothing high frequency, and I did not expect to do precision measurements with it, I only wanted to know if a signal was present or not.At first I couldn't get the scope to sync in on any waveforms and was about to pack it up and send it back. Then I saw a video review on youtube and noticed that the guy always hit "Auto" first, and then his waveform was rock solid. Mine still doesn't lock in after hitting Auto, but after Auto, I can add a little to trigger level and then I get a rock solid display. However, changing vertical or horizontal scale will often lose sync, and trigger level doesn't get it back, so there is still an inherent trigger problem with the scope.The next problem I had was scale. If you're looking at an RC servo signal, it's a 1ms to 2ms pulse every 16ms or so. After pushing Auto, the display shows 3 pulses, each about 3 pixels wide. If you change the time base to zoom in, then you limit yourself to the upper right hand (or left hand with falling trigger) quarter of the screen. There is no way to move the waveform left and down so you can take advantage of the rest of the screen. This should be a simple firmware fix and would greatly enhance the usability of the scope.So my suggestions to AllSun:1) Fix the trigger instability problem2) Add waveform positioning in the x and y directions, this should be an easy firmware fix3) Use a higher resolution display1) and 2) would appear to be firmware only fixes. Certainly 2) is firmware only. If 2) were implemented, then it would reduce the necessity for 3), although a higher resolution screen is always desirable.All in all, my overall impression of the AllSun ends up to be very positive in spite of my initial frustration. It took some getting used to, but it's small enough, light enough, and cheap enough to carry around and not worry about it. It does exactly what I wanted it for: it shows me if something is happening or not. Like other reviewers have said, it's a very good bang for your buck. Just don't expect a high end precision instrument for how little you pay.

Easy to use. Not perfectly accurate. The frequency reading is not even usable its so far off. Strange too considering you can calculate it just by looking at the screens refresh and the distance between peaks.Probe is nice.LCD is extremely primitive for what you pay for. For twice the money can get 4 channel, saves to sd card, internal and uploads off USB. And it has a 7 inch tft lcd display?I mean this one has a decent response time on the LCD.For quick on site use its great. But definently efinantly products for double or triple the money that have 6 to 8 times the features.

Review of All Sun EM125 O scope. I've only had the scope for a short time,but it appears to be better than any scope I have seen in its price rangeand frequency response.There are a number of pocket scopes available butnot with 25mhz response.I teach electronics to medical technicians in Africa and I am alwayslooking for an inexpensive scope for the student to take with them. Whilethe class room has OWON dual trace scopes, the students go back to workwith out a scope as the program will not fund the OWON.type scope.I have only tested this scope to 2mhz and the signal looks good. Thecontrols are logical but take a bit of time getting used to. The screen isquite readable but I would prefer a little more resolution. The resolutionwas properly advertised however.The capacitance mode works well and seems to be quite accurate.I found that with the supplied leads (about 4 feet) the resistance valuesbounced around quite a bit, but when I used short leads the measurement isstable and accurate.When I received the scope the battery was not connected, and the scopewould not work. There was no mention in the manual about this. Afterconnecting the battery it worked fine.Larry

I was blown away by the practically of this pocket scope, it's nothing fancy (i.e. no touch screen or other bell/whistle to break) but perfectly serves my needs!I was making a strobe light for measuring speed (so needed tunning) and the scope triggered over and over as I uploaded code and scrambled the signal. it's algos are solid.for the price, I see no reason why every maker w/o scope access shouldn't have one of these. it's a great deal

Funciona. Y es mejor tener esto que no tener nada. Se usa para diagnóstico de mecánica automotriz.