The LT-10 lamp tester serves to detect faults in malfunctioning fluorescent tubes. The gas filling is checked first, then the voltage. Both tests can be carried out with the test tip or with the extendable 122 cm antenna. The latter enables safe working without a ladder. The final step involves checking the filament. All test results are displayed visually and to some extent acoustically as well. The device has only one button and is easy to use.