The Fluke 1535 and 1537 2500 V insulation resistance testers are designed to simplify first-line troubleshooting, whether you are on the factory floor or working on site at a solar installation. With these testers, where the user can select test voltages from 250 V to 2,500 V and with resistance measurements up to 500 GOhm, you can do more work with a single instrument. Featuring an intuitive user interface, a short-circuit current of up to 5 mA and a CAT IV specification of 600 V, these portable high-voltage insulation testers can make fast and stable resistance measurements wherever you take them. The 1537 Insulation Resistance Tester also allows you to save measurements for later review or transfer via PC using the supplied software.