Choosing an insulation resistance tester means balancing test voltage range, safety on live circuits, and cost. The Fluke 1507 sits in the multimeters electrical testers category as a 1000V-capable megohmmeter. This review covers the details that matter most on the job.
Quick verdict
The Fluke 1507 is a capable insulation resistance tester for electrical contractors and industrial or commercial electricians. At USD 611.00, the listing includes NIST traceable calibration with data, automatic PI/DA calculations, and a compare function for pass/fail testing. If you regularly check insulation on cables and equipment, this tool can save time. If this is a once-in-a-while task, the investment is harder to justify.
Who it suits
This tester suits professionals who perform insulation resistance testing as part of regular work. The 50, 100, 250, 500, and 1000V test voltages cover a wide range of equipment, from low-voltage control wiring to higher-voltage industrial gear. The 0.01M to 10G ohm insulation resistance range gives you room for simple cable checks and detailed insulation assessments. If you need to document readings and track insulation health over time, the range and test voltages give you the flexibility to do that.
What stands out
Several details make the Fluke 1507 more than a basic megger. It automatically calculates Polarization Index and Dielectric Absorption Ratio, which are useful for evaluating motor insulation condition over time. The compare function lets you set a pass/fail threshold so you don't have to interpret every reading manually. Live circuit detection prevents an insulation test when line voltage is present, protecting both you and the instrument. Auto-discharge of capacitive voltage adds another layer of safety after testing cables or capacitors. Beyond insulation testing, the Fluke 1507 also measures resistance from 0.01 ohms to 20.00 k ohms and AC/DC voltage from 0.1V to 600V, making it useful for low-resistance checks and basic voltage verification.
Meaningful trade-offs
The biggest trade-off is price. At USD 611.00, the Fluke 1507 is a serious investment, especially because it is built around insulation testing rather than general-purpose multimeter work. The listing is for a new unit in an open box, so the packaging may not be pristine even though the tester is new. For a professional who does insulation testing regularly, the feature set can justify the cost. For someone who only rarely needs this kind of test, the expense is much harder to swallow.
Fluke 1507 Insulation Resistance Tester 1000v NEW IN OPEN BOX
The five test voltages and 0.01M to 10G ohm insulation range cover most professional insulation checks. It includes NIST traceable calibration with data. The combination of live-circuit detection and auto-discharge makes it a strong safety pick for field work. The downside is the open-box condition, so the value depends on how often you will actually use insulation testing.
Bottom line
The Fluke 1507 insulation resistance tester is a practical choice for electrical contractors and industrial electricians who need a 1000V-capable tester for routine insulation checks. If your work involves insulation testing regularly, this tester can pay for itself in time saved and added safety. If you only need occasional checks, the cost may outweigh the benefit.
