Instruments used for monitoring and taking measurements from electrical and electronic equipment and devices, and from electronic circuits or circuit boards thereof, said instruments being devices for measuring parameters and quantities associated with electrical currents and parameters and quantities associated with devices capable of conveying electrical currents, namely, digital multimeters, voltmeters, ammeters, ohmmeters, oscilloscopes, digital oscilloscopes and digital storage oscilloscopes; instruments used for monitoring and taking measurements from electrical or electronic equipment and devices, and from electronic circuits or circuit boards thereof, namely, temperature measurement instruments, continuity and diode checkers and electronic data loggers; all of the aforesaid being instruments that operate together, including wirelessly, with a smartphone or other display device to display or present the measurements or readings obtained using the instrument