The display also gives a visual feedback about the state of the installation. If the installation is OK, the display will remain blue. In the event of a faulty installation, the display of the earth tester changes to a red background. The earth tester consists of a read-out unit, which is plugged into the socket as a whole and a safety test tip, which is connected to the reading unit via the underside. The safety probe has a cable length of about seven meters.
| Measuring principle | Continuity test / earth resistance measurement |
| Measuring range | 0 ... 2000 Ω |
| Display | two-color, backlit LCD |
| Measurement accuracy | ± (3 % + 3 Digits) at 0 ... 200 Ω at 23 °C ±5 °C |
| Operating voltage | 230 V (Ph/N) -10 / +6 % |
| Operating frequency | 50 / 60 Hz |
| Standards | IEC 611010-1 EN 61557-4, Class II, IP40, IK06 |
| Installation category | III |
| Operating temperature | -15 ... +45 °C / +5 ... +113 °F |
| Storage temperature | -25 ... +70 °C / -13 ... +158 °F |
| Dimensions | 72 x 210 x 50 mm (W x L x H) |
| Length of test cable | ca. 7 m / 22 ft 11" |
| Weight | 340 g / 12 oz |
