Ambu® BlueSensor ECG Electrodes x 100 Unique construction, advanced production methods, careful and original design, application-specific user features and proven quality make Ambu BlueSensor electrodes the most reliable and cost-effective electrodes on the market. The combination of wet gel and superior quick adhesion provides optimal signal quality during 12-lead diagnostic resting applications. Ten SU electrodes are packed on a single liner so there is no need to peel off individual backing material. Thanks to the special occlusive backing material, the electrode is resistant to liquids.