The Fluke 1535 and 1537 2,500 V Insulation Resistance Testers are engineered to simplify frontline troubleshooting whether you’re on the factory floor or working in the field at a solar installation. With user selectable test voltages from 250 V to 2,500 V and resistance measurements up to 500 GΩ these testers allow you to cover more workload with a single tool. Equipped with an intuitive user interface, a short circuit current of up to 5 mA and a CAT IV 600 V rating these portable high-voltage insulation testers can deliver rapid and stable resistance measurements no matter where you take them. The 1537 Insulation Resistance Tester also allows you to store measurements for later review or PC transfer, using the provided software.
• Selectable Voltage Tests: Tailor your tests with user-selectable voltages of 250 V, 500 V, 1000 V, and 2500 V to cover both industrial and solar applications.
• Extended Insulation Resistance Measurement: Reach up to 500 GΩ in insulation resistance measurement for a thorough analysis.
• Intelligent Calculations: Automatically calculate Polarization Index (PI) and Dielectric Absorption Ratio (DAR), minimizing the influence of environmental factors.
• High Measurement Capacity: Execute up to 1,300 measurements at 2,500 V or 6,500 measurements at 250 V on a single charge, enhancing productivity.
• Enhanced Safety Features: Benefit from a CAT IV 600V rating and a built-in voltage alarm function for heightened safety during operations.
The Fluke 1537 has these additional features:
• Extended Measurements: The Fluke 1537 enhances your testing capabilities with AC/DC voltage and resistance measurements.
• Stable Resistance Measurements: Achieve faster, more stable insulation resistance measurements with a short circuit current up to 5mA.
• Fine-tunable Test Voltage: Adjust the test voltage from 250 V to 2500 V in 100 V increments to meet specific testing requirements.
• Dielectric Discharge Rate Calculation: Automatically calculate the dielectric discharge rate (DD) to aid in identifying elusive insulation issues.
• Ramp Test Mode: Linearly increase the applied test voltage 100 V/s to help identify potentially hard to identify fault conditions.
• Visual and Audio Continuity Indicator: Verify continuity visually on the screen display or with the audible indicator so you can focus on your testing procedure without looking at the display.
• Customizable Testing Parameters: Set user-defined labels, adjust test duration, and store measurement results for a tailored testing experience.
• Effortless Data Management: Download and manage data effortlessly with the provided PC software.
• Extended Warranty: Enjoy peace of mind with an extended 3-year warranty.

Key Features
• User-selectable voltages of 250 V-2500 V
• Up to 500 GΩ insulation resistance measurement
• Short circuit current up to 5mA for fast, stable measurements
• Automatically calculate PI and DAR
• Perform 1,300+ insulation tests on a single charge

• Be aware of voltage easily - the tip glows red and a beeper sounds when voltage is detected
• Continuous self-test so you always know it’s working
• Voltage detection range for wide application use - 90 V to 1000 V AC or 200 V to 1000 V AC
• Audible/Silent mode for added convenience

• OpenJaw™ design: measure current without breaking the circuit
• Tester automatically selects AC or DC voltage, up to 1000 V
• Work in tight spaces with detachable Slim Reach probe tips

The Fluke 1507 is a versatile, compact, handheld insulation tester for advanced industrial and electrical insulation testing. Its multiple test voltages make it the ideal tool for many troubleshooting, commissioning, and preventative maintenance applications.
Take advantage of the 1507 full feature set to easily and quickly perform advanced insulation resistance testing. Its handy size and light weight make it easy to pack and use. Additional features, like the remote probe, save both time and money especially when performing repetitive tests. And its reasonable price and rugged reliability make it an excellent value.
Other useful capabilities:
• Performs insulation tests from 0.01 MΩ to 10 GΩ
• Includes live circuit detection to prevent insulation test if voltage >30 V is detected
• Includes auto-discharge of capacitive voltage for added user protection
• Measures AC/DC voltage from 0.1 V to 600 V and resistance from 0.01 Ω to 20.00 kΩ
• Provides lo-ohms earth-bond continuity (200 mA)
• Simplifies repetitive or hard-to-reach testing with the remote test probe
• Saves battery power with auto power off
• Presents results on a large, backlit display
• Features CAT IV 600 V overvoltage category rating
• Comes with remote probe, test leads, test probes, alligator clips and one-year warranty
• Accepts optional Fluke TPAK magnetic hanging system to free your hands for other work
• Runs on four AA alkaline batteries (NEDA 15 A or IEC LR6) for at least 1000 insulation tests

Key Features
• Rugged, compact advanced insulation resistance tester for electrical contractors and industrial and commercial electricians
• Automatically calculates Polarization Index and Dielectric Absorption Ratio
• Makes repetitive tests simple and easy with a Compare (Pass/Fail) function
• Offers multiple insulation test voltages: 50 V, 100 V, 250 V, 500 V, and 1000 V