Ground tester for measuring earth resistance, installation category III, with a 7-meter measuring cable at the safety test probe. High measurement accuracy, protection class IP40, operating voltage of 50-60 Hz. The ground tester is a compact measuring device. Its robust and ergonomic design allows the user to work comfortably with the ground tester. The earth resistance can be quickly determined. Additionally, a test can be performed to check whether the grounds are interconnected. To ensure clear readings, the ground tester features a large, well-designed, multicolored LC display. The display also provides visual feedback on the condition of the installation. If the installation is correct, the display remains blue. In the case of a faulty installation, the display changes to a red background. The ground tester consists of a reading unit that is plugged entirely into the socket and a safety test probe that is connected to the reading unit via the underside. The safety test probe has a cable length of approximately seven meters.