This system provides repeatable,label free automated TEER measurements to electrically monitor the barrier function of epithelial and endothelial cells as they are grown in normal CO2 high humidity incubators. Data is collected continuously and reported as real-time changes in barrier function of cell layers in ohm-cm2. 
 
Non-invasive measurements may be made continuously for days and even weeks. The fixed position of electrodes throughout the measurements eliminates operator variability allowing precise and repeatable measurements of endothelial layers with weak barrier function (<10 ohm-cm2). No need to take the station out of the incubator eliminating 
temperature variations.