MIKROE-3083 Tester click Mikroe MIKROE-3083 Tester click is a diagnostic tool that contains an array of 2x6 LEDs, which signalize the presence of the HIGH/LOW logic level on each pin. This provides visual feedback to the developer. Two additional LEDs indicate the presence of +3.3V and +5V on the mikroBUS™ power rails. Save hours of troubleshooting, and from having to connect various complicated measurement instruments to test logic states on specific mikroBUS™ pins.