Hello! I was wondering if the Sensor Cable - Electrode Pads (3 connector) and the Disposable Surface EMG/ECG/EKG Electrode are able to connect to something like the SparkFun THAT 1206 InGenius Breakout or another audio input module so that you can read specific EMG/ECG/EKG levels. If not, what module would be able to do that?
Similarly, would all of they products be compatible with a raspberry pi pico, or just arduino?
Thank you all so much for your time 
No, the THIS and THAT boards are not capable of reading EKG/ECG at all. You need the pads in conjunction with a board like the AD8232 to do that.
https://www.sparkfun.com/products/12650
Pads along with a Myoware will allow EMG.
https://www.sparkfun.com/products/retired/18977
Both are compatible with any controller that has an analog input. The pi doesn’t have analog input but you can add analog capability with an analog to digital converter. (ADC)
Thank you so much for the help! Although, will the AD8232 be able to read specific ECG/EKG levels and be able to send that specific value to the ADC?
Yes