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

• 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

Save time with precise infrared levels and analysis

Whether you're on the roof checking heating, ventilation and air conditioning, deep in the factory checking motors, or if you've locked down the electrical panels, you rely on a tool that has the power and features to do the job quickly.



The Fluke TiS20+ and TiS20+ MAX handheld thermal cameras put the power of thermal imaging at your fingertips. Designed to make your job faster and easier, this thermal imager is the perfect tool for:

- Commercial electrician

- Heating, ventilation, air conditioning and refrigeration technician

- Maintenance technician



Get context with a combination of visual light and infrared images

In thermography, context is important. Let Fluke IR-Fusion™ make your job easier by using a thermal image superimposed on a visual light image to provide a complete picture of where an issue is a problem before it actually becomes a problem. Just slide your finger across the screen to adjust the infrared level. Whether you're experiencing an uneven load on your switchgear or checking your ventilation system, the Fluke TiS20+ helps you quickly detect issues.



You work hard all day, your tools too

You must not let your thermal imager be damaged by the environment. You can sleep well at night knowing that your camera will stand up to whatever the day throws at it.

- 2 meter high drop test

- Waterproof (IP54)

- Dustproof (IP54)



Stop sorting, start analyzing with Fluke Connect Asset Tagging

Avoid long hours on the computer setting up your thermal images, let Asset Tagging do all the work for you. No more dragging and dropping or renaming files in the office, just scan the QR code on your assets, take thermal images and they are automatically sorted by assets. Start spending your time analyzing images and creating reports instead of sorting files one by one.



Longest battery life in a Fluke thermal camera

The TiS20+ and TiS20+ MAX work non-stop, with a battery life of over 5 hours of continuous use making it the longest battery life in a Fluke thermal camera. Save battery power for multiple inspection points with sleep mode. Just press the power button once and you are ready to go.

Key features
• Lightweight, portable, and fast
• Built-in two-channel readout for PRT, RTD, thermocouple, 4-20 mA current
• True reference thermometry with accuracy to ±0.01 °C
• On-board automation and documentation
• Metrology performance in accuracy, stability, uniformity, and loading