Microelectrodes and ultramicroelectrodes (UMEs) bring electroanalytical measurements down to the micrometer scale, where reduced double-layer charging, faster mass transport and minimal IR drop change what is possible in voltammetry, amperometry and localized sensing. The catalog covers platinum, gold, silver, palladium, iridium, titanium and tungsten metal microelectrodes with disk diameters from 10 µm up to 200 µm, in glass-bodied formats compatible with standard electrochemical workstations. Suitable for cyclic voltammetry at high scan rates, single-cell and single-particle electrochemistry, biological microenvironment studies and analytical work where sub-millimeter electrode footprints matter.