Pocket Sized Digital Oscilloscope DSO201 (DSO Nano, DS201) from AliExpress (cost about 50$). Test and Review.
The DDS-generator GK101 is manufactured by a Chinese company Ginko. This generator is also available under the name IDSG101 of the company ITead. It’s a full analogue. The average cost is around 100$ (on Aliexpress).
Direct Digital Synthesizer (DDS) is a type of frequency synthesizer used for creating arbitrary waveforms from a single, fixed-frequency reference clock.
907 Adjustable Soldering Iron 60W for 10$ from the AliExpress. Full Review and Test.