2021-11-24 · Fluke 1587 Insulation Multimeter. Two products in one: Powerful Insulation Tester and Full-featured Multimeter. Ideal for work on motors, cables, and switch gear. Large display with backlight. Filter for motor drive measurements. Insulation test (0.01 MΩ to 2 GΩ) Insulation test voltages (50 V, 100 V, 250 V, 500 V, 1000 V) for many applications.