This device is an analog electronic analyzer (Electronic Analyser), model AE 86/EV, produced by the Italian company Elettronica Veneta. Here are the details of its functions and measurement ranges visible on the interface: 1. Basic Function It is used as a high internal resistance ohmmeter/voltmeter/ammeter (Multimeter) (FET Analyser/VTVM type), with an internal resistance of 11MΩ for DC voltage measurements and 10MΩ for AC voltage measurements. This allows for measuring sensitive electronic circuits without loading them or affecting their readings. 2. Measurement Ranges (Ranges) DC and AC Voltage (V / V~): From 0.3 volts to 1000 volts. Resistance (Ω): Several ranges from 1Ω to 1MΩ. DC and AC Current (μA / mA): In microamperes: 3μA, 30μA, and 300μA. In milliamperes: 3mA, 30mA, and 300mA. A special port for higher current up to 3A. Decibels (dB): For measuring sound/signal levels from -20dB to +60dB. Battery Check (BATT / Diode): A dedicated range for checking battery status and testing diodes. 3. Ports and Power External Power (EXT 9V DC): A jack for connecting an external 9-volt adapter. Lower measurement ports: High current port ⁠3A⁠. Common ground port ⁠GND⁠. Battery/Diode test port ⁠BATT⁠. Integrated BNC signal port.