The ohmmeter has been designed to simplify troubleshooting on-site in both industrial facilities and solar installations. With selectable test voltages ranging from 250 to 2500 V and resistance measurements up to 200 GΩ, this device allows multiple tasks to be performed with just one tool. The intuitive user interface, short-circuit current of up to 1.8 mA, and safety compliance with CAT IV 600 V make these portable high-voltage insulation testers ideal for quick and stable resistance measurements anywhere. The test voltage can be variably set to 250 V, 500 V, 1000 V, 2000 V, and 2500 V. Additionally, it can measure AC and DC voltages from 10 to 600 V. The ohmmeter features a memory for 100 data records, which can be accessed via the LC display. In addition to the data hold function, the ohmmeter offers the capability to measure the Polarization Index (PI) and the Dielectric Absorption Ratio (DAR). These functions are particularly useful for condition monitoring and maintenance of electrical insulation, as they help to identify potential issues early and extend the lifespan of the equipment. A high-voltage indicator ensures safety during operation, and a low battery indicator signals when a battery replacement is necessary. The device is especially suitable for measuring insulation resistance in various electrical devices and insulating materials such as motors, cables, switches, and other electrical components, making it ideal for maintenance, repair, and testing tasks. With its modern design and stable performance, the device impresses in every respect. For easy storage and convenient transport, the ohmmeter is supplied in a practical zippered bag.