some are not. If yours is not switchable, then come here and just get the internal power supply changed. Typical cost is about $20, and it takes only about 10 minutes. (The ThailandGuru can do this for you if you wish, but there would be a guru service charge on top.) PC's are...
The blue dot denotes reference electrode (near electrode #1) and the crosses denote the position of scanning electrodes. The development of the anomaly over time is due to the corrosion of the metal bar. Ref denotes the references (zero potential) for the array of electrodes in the self-...