DSO138 was designed as a training oscilloscope kit. It performs the basic oscilloscope functions and is easy to use. 

The heart of the DSO138 is a Cortex-M3 ARM processor (STM32F103C8) from ST. It uses a 2.4-inch TFT LCD (320 X 240 dotmatrix, 262K colors) as its display element and provides clear waveforms. 

DSO138 is partially open-sourced. This allows users to add different features or develop new applications on the hardware.

Although this kit comes with instructions on how to build it you will need some experience reading electrical diagrams.

NOTE: This kit has the SMT sodering done already

Specs:
Number of Channels: 1
Analog Bandwidth: 0 - 200KHz
Sensitivity: 10mV/Div - 5V/Div
Sensitivity error: < 5%
Resolution: 12-bit
Input Impedance: 1M ohm
Maximum Input voltage: 50Vpk
Coupling: DC, AC, GND
Max Real-time Sampling Rate: 1Msps
Timebase: 10us/Div - 500s/Div
Record Length: 1024
Trigger Modes: Auto, Normal, Single
Trigger Types: Rising/falling edge
Trigger Position: 1/2 of buffer size fixed
Display: 2.4-inch color TFT LCD with 320 x 240 resolution
Power Supply: 9V DC (8 - 12V acceptable)
Supply Current: 120mA
Physical Dimension: 117mm X 76mm X 15mm
Weight: 70 gram (not including cables)

Note:This is a kit which requires users to have adequate soldering skills in order to complete.  A Power supply is not included in the kit a 9V DC power supply is required to run DSO138. It is recommended to use the 5V-to-9V Step-up Converter JYE140 to power DSO138 by battery or USB.