Compact, all-in-one tool that combines the functionality of an oscilloscope, multimeter, and signal generator into a single handheld device. Particularly good for automotive diagnostics, electronics hobbyists, and educational use. Here's a deep dive into what it offers and where it might fall short:Key Features:3-in-1 Functionality: This device integrates an oscilloscope with two channels, a 4-digit multimeter, and a DDS signal generator. The oscilloscope has a 10MHz bandwidth and a 50MSa/s sampling rate, which is quite substantial for a device of this size and price. The multimeter provides 10,000 count measurements for a wide range of electrical parameters including voltage, current, resistance, capacitance, and more. The signal generator can output seven different waveforms up to 2MHz.Portability: With a 2.8-inch high-resolution LCD and a built-in 3000mAh lithium battery, this device is notably portable, offering up to 6 hours of standby time. It comes with a carrying case, enhancing its field usability.User Interface: The device features a straightforward interface with dedicated buttons for switching between modes, which can be a boon for quick diagnostics in various environments. It supports waveform screenshot saving, allowing for later analysis or sharing.Pros:+ Versatility: Ideal for those needing multiple tools in one package, especially in scenarios where space or cost is a consideration. It's particularly useful for automotive technicians who need to diagnose issues like CAN bus signals, sensor outputs, or battery conditions.+ Cost-Effectiveness: Given its range of functions, this device offers significant value, especially if you would otherwise be purchasing separate tools for each function.+ Ease of Use: The one-click save feature and automatic measurement options make it beginner-friendly, yet it is capable enough for professional use.Cons:- Bandwidth Limitation: The 10MHz bandwidth might not be sufficient for high-frequency applications, limiting its use in advanced electronic troubleshooting where higher bandwidth oscilloscopes are needed.- Interface Complexity: While generally intuitive, users new to oscilloscopes might find navigating through all functions a bit overwhelming due to the plethora of settings and options within a limited physical space.- Accuracy and Calibration: Some users have noted that while the multimeter and oscilloscope functions are reasonably accurate, they don't match the precision of dedicated, higher-end equipment. Calibration might be necessary more often, especially with environmental changes or prolonged use.- Signal Generator: The signal generator, while functional, has a maximum frequency output of 2MHz, which might not be adequate for users needing more sophisticated signal generation for testing or calibration purposes.Conclusion:The FNIRSI 2C23T is an impressive tool for its price point, offering a trifecta of essential electronics diagnostic tools in a compact form factor. It shines in educational settings, for hobbyists, or in automotive diagnostics where space and functionality are key. However, professionals requiring high precision or dealing with higher frequency signals might find its limitations restrictive. If you're looking for a cost-effective, multi-tool solution for basic to intermediate troubleshooting, this device could be a wise investment. But for more advanced applications, consider dedicated equipment.

This handheld multimeter/oscilloscope with a built-in function generator is really handy to have as an electrical hobbyist. It’s not as nice as having a dedicated desktop oscilloscope or multimeter, but if you don’t need anything super fancy this is a lot cheaper and more portable. The device has a pretty nice UI and I found all three features pretty easy to utilize, though the oscilloscope has a lot going on and takes a minute to learn. I tried testing all the features using a power supply, 2 other multimeters, and another portable oscilloscope and was pretty impressed with the results.The multimeter worked pretty well though is better for some measurements than others. I found the voltage measurement to be about 50mV or so off compared to measurements made by other multimeters, so it works better at higher DC values. For current measurements it was pretty spot on if you measure low currents in the low current mode and high currents in the high current, measuring low currents in the high current mode is not as accurate though. Across all the multimeters I compared with the resistance values were not quite in agreement, so it was difficult to test the accuracy of the resistance measurement, though it’s certainly good enough for just double checking a rough resistor value without looking at the color codes. Finally I tested capacitance against the stated capacitor values and another multimeter. I found the capacitance for lower values to be more accurate. A 101 ceramic capacitor measured spot on at about 104 pF, while a 47uF electrolytic capacitor measured around 52 uF (which it could be since the tolerance for the components is not very good).I wasn’t able to test the oscilloscope as much as I would have liked since I do not have another function generator, and the device cannot measure its own function generator. I just tested it against a wall outlet and found the duty cycle and frequency to be spot on. The voltage was not correct, but I believe that’s just because the device as a 10V/div max and it was just clipping. Since usually the amplitude is not as important as other measurements with an oscilloscope I am happy that the other measurements seem pretty accurate. It was a little difficult to navigate with cursors and change settings in this mode, but it’s possible. I did find it easy to list various measurements on screen, such as frequency, peak to peak voltage, max voltage, duty cycle, etc.Finally I tested the function generator and was very impressed. It’s pretty simple to select the various kinds of waveforms you want to make, and also manipulate the amplitude, frequency, and duty cycle. I tested the generator against another portable oscilloscope and found that the waveforms produced were very accurate and crisp. The max voltage you can do is only 3.3V, I wish it could 5V, but it’s very nice otherwise. Something to note is that I only tested up to around 10kHz, though it can go way higher than that.

Compact and easy to use! Very happy with the quality and solid construction.