MEDICAL DEVICES FOR THE DETECTION, MEASUREMENT, AND MONITORING OF PHYSIOLOGICAL SUBSTANCES AND PARTS AND ACCESSORIES THEREFOR, NAMELY, PLATES CONTAINING ELECTRODES AND GEL COLLECTION DISCS, QUALITY CONTROL SENSORS, QUALITY CONTROL TEST PADS, BATTERY CHARGERS FOR USE WITH MEDICAL DEVICES, ELECTRONIC ADAPTERS FOR USE IN DOWNLOADING DATA FROM MEDICAL DEVICES AND DATA ANALYZERS FOR MEDICAL DEVICES