Electrodes, probes for scientific use; measuring instruments, combinations thereof and components therefor (including computer programs, computer devices, electronic controls, screens, sensors, stands, housings, connectors) for measurement, control and regulation of physical, chemical or analytical properties, in particular for titration, pH measurement, redox measurement, ion analysis, selective ion measurement, oxygen measurement, ozone measurement, carbon dioxide measurement, dissolved gas measurement, conductivity measurement; tripods for apparatus for scientific use; tripods and stands for measuring instruments, electrodes or probes for scientific use; tripods and stands for accessories for measuring instruments, electrodes and probes for scientific use; tripods and stands for calibration fluids for measuring instruments, electrodes and probes for scientific use; accessories for the aforesaid tripods, in particular lab cups, clamps and stands for mounting on tripods.