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By using small nanoelectrodes as tips in a scanning electrochemical microscope (SECM), we recently imaged individual surface\u2010bound 10\u201350\u2005nm metal NPs. Herein, we introduce a new mode of SECM operation based on tunneling between the tip and a nanoparticle immobilized on the insulating surface. The obtained current vs. distance curves show the transition from the conventional feedback response to electron tunneling between the tip and the NP at separation distances of less than about 3\u2005nm. In addition to high\u2010resolution imaging of the NP topography, the tunneling mode enables measurement of the heterogeneous kinetics at a single NP without making an ohmic contact with it. 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