Hello,
I have just finished very similar 2 projects. These devices were developed for the AC electrical network quality analysis (maximum voltage is 500VAC). They allow you to track the voltage (RMS, max, min), frequency, current and higher harmonics in the network. The information is displayed on the OLED. It can be transmitted to other devices via the RS-485 interface and logged to the SD card. The devices are UL certified.
Please, feel free to visit my profile page and look through them: 1) AC Network Harmonic Analyzer; 2) Smart Outlet
While projects design I was responsible for selecting all the components, designing schematic and PCB, BOM generation, fabrication support, prototyping, as well as developing a firmware.
Also, I have a highly skilled team, which decreases the project developing time.
If you have any questions, please, contact me.