Using the Fluke T6-600 Electrical Tester is quite easy. If you want to measure voltage, you can choose to use the test leads or take advantage of the FieldSense technology and measure through the open fork up to 600V. To measure current, just slide the open jaw over the conductor. When measuring, there's no need to open covers or remove wire nuts, which saves you time. As for safety, always make sure the device is in good condition before use. Don't try to measure voltages higher than 600V. When it comes to maintenance, keep the tester clean. If the batteries run out, replace the two AA batteries with new ones. Store the tester in a dry and cool place to keep it working well for a long time.