Talk:Scanning Kelvin probe

x,y plane
What does "x,y plane" in the lead signify? No coordinate system has been introduced. Is it technical lingo for horizontal plane?--Nø (talk) 06:51, 20 June 2019 (UTC)
 * This still needs to addressed! Also, image caption has "x,y,z axis" that makes little sense on its own.--Nø (talk) 17:36, 13 December 2019 (UTC)