Quantity   Component name
1 × Arduino Uno ... or compatible. Or pick Yun if you want IoT ECG.
1 × Olimex EKG-EMG shield
1 × Olimex SHIELD-EKG-EMG-PA Electrodes
1 × 3D-printed box ... of custom, open source design, available at gihub.
3 × Screws is it M4 screws or what? Don't know exactly, thwy were just sitting around.