The CardioExpress SL12, SL6 and SL3 computers can read 12-lead ECG tests and can store 200 ECGs, if desired. These models can archive their readouts to the Sentinel Cardiology Information Management System, as well as its barcode reader. The SL6 uses six channels and is suitable for many healthcare facilities. The SL12 uses twelve channels for larger applications. These two models are properly designed to be easy to handle and control while capable of being carried anywhere. They have pacemaker detectors, rechargeable batteries that can be recharged through an AC/DC power supply, full keyboards and one-touch controls. The models also have their own internal thermal printers and can link to outside printers too. The automatic measurement system can also adjust itself for both adult and child patients.