Quimat Updated 2.4" TFT Digital Oscilloscope Kit with Power Supply and BNC-Clip Cable Probe Q15001 (Assembled Finished Machine)

 I really like this as a general purpose part tester. I haven't tried the other functions yet. The graphic screen on this tester gives much more information and is more pleasing to look at than the previous 2-line character LCD version I built a few years ago. I like that it comes with a ZIF (zero insertion force) socket for ease of use and longevity. The rotary encoder works well enough to turn the tester on, change modes and turn it back off. I also like that this came with standoff feet.I am fairly experienced in soldering/repair work and this still took me about an hour and a half to build. There are absolutely NO INSTRUCTIONS that come with this. For the most part this wasn't an issue as the silkscreen on the PCB has clear component values for most things. Where it was a bit of a question was with two of the three SMD components which were a little hard to tell which orientation to use.The build approach I took was:1. Solder the three SMD components (see picture for orientation)2. Solder all the resistors (use a color code guide or DMM to identify values)3. Solder all the capacitors (make sure you get polarity correct on the electrolytics)4. Solder the transistors, LED, crystal, and IC socket5. Finish up by soldering the LCD headers, power socket, ZIF socket, rotary encoder, and terminal blocks6. Install the ATMEGA328P IC, LCD screen, and standoffs7. Plug a battery in, turn it on, and enjoy (hopefully)!

surface mount components not installed so be sure you line up the dot for them . and yes, it is VERY small. be sure you study up on how to work with tiny components like this. (you can look up my other review about the same device and how the components are supposed to line up with a picture)this was a very enjoyable project to build and even if you are not concerned if its exactly accurate, you will find it very nice to graphically display pinouts on transistors when they dont follow the same specs for identical numbered packages. being able to run this from battery or plugin jack is a very nice option (notice my header pins in place of the 9V connection, where i have to 9V as a plugin when needed. )building it is easy, even if there are no included manuals all values are marked on the board.for info on this device search "mikrocontroller" and model type. you will find schematics and information if you do a little research while its on its way to you. (this portion was edited from original posted review to remove URL, since im not allowed to help people find the original designer of this but the exact URL is burned into the device when doing a self test)to those that dont know how to find the menu, you spin the encoder knob.all needed software is already flashed on the chip.the pictures show a freq generator, PWM generator, and a tested transistor, the device can also test voltage, and an external frequency measurement. i use it to determine BCE of trans packages and general ranges on passive components.i actually used this to assist in assembling another identical tester.[initial review was denied by amazon for having a URL i guess, my edits and updates are another attempt to say "i really like this in my toolbox" so now you get pictures too] [is this better amazon mods?]

All I need to do is trace a few line-level audio signals. Dual channel would be nice, but this single channel device is up to the task. Plenty of dynamic range and frequency response. I'm happy, and impressed that so many features are packed into something the size of a pack of cigarettes.

I guess it may be worth the low cost but it didn't suit my needs. A decent meter with built in scope does better than this does. Even using the built in calibration signal showed several mv noise in the signal. If your measuring broad or high ranging signals then it would be ok. Even tried using a Techtronics 10x probe and had the same results.

Great for auto diagnostics with more than enough accuracy and time scale range for camshaft, ABS and other 12V or 5V signals.A dual channel would be preferred but for the price this is a great tool.

Quimat Multifunctional Transistor Tester with LCD came nicely packed without any damage. This is a DIY kit., Where it comes with the PCB board and all the components that require assembling. PCB is made of quality materials and has labeling for all of the parts. Resistors come without any labels. So you need to look up the color code or need to use a multimeter to check the value. Once assembled this can be used as a voltmeter, frequency meter, signal generator and a device that measures all kinds of component parameters.

Very nice probe set. Colored rings for each end of the lead let me identify which channel the probe is connected to at a glance. A spring loaded clip end for the probe lets me clamp the probe in place where possible while insulated tips allow the probe to get into dense wiring situations without danger of the top shorting between connections. Of course, the probe has necessary compensation adjustment to "tune" it to the input of the scope, and the set includes an insulated screwdriver to make that adjustment. NOTE: when I ordered a pair of these the shipper made a mistake and sent only one probe. Instant response when I notified him of the problem. The shipper explained that he had only 1 in stock and intended to hold it til new stock arrived, but the package was sent in error. He offered refund for missing probe, or discount on 2nd probe, or whatever I needed to be happy. I told him just to send the 2nd probe when he received it. He promised he would. HE DID!! In about a week I received the second probe. Seems like an honest dealer with whom I would not hesitate to do further business if the need arises.

Nice little unit for most needs, bought it primarily to set gains on car amps, tested against my bench scope and another well known audio tool and this little thing held its own, not as simple to use as DD1 but for the money and the extras you get over a DD1 it's great, bought a 9v battery adaptor plug so I don't need AC to use it, very pleased with it.