Fluke 1535 Insulation Resistance Tester and Megohmmeters

The Fluke 1535 Insulation Resistance Tester provides high-voltage insulation testing in a portable, rugged, and easy-to-use design, making it ideal for frontline troubleshooting, preventive maintenance, and field diagnostics. With user-selectable voltages of 250 V, 500 V, 1000 V, and 2500 V, the tester can handle diverse testing requirements across industrial equipment, power systems, and solar installations.

Capable of measuring insulation resistance up to 500 GΩ, it features a short-circuit test current of 5 mA to deliver faster and more stable measurements even in demanding conditions. The tester automatically calculates the Polarization Index (PI) and Dielectric Absorption Ratio (DAR), enabling quick assessments of insulation quality without additional manual computation.

The Fluke 1535 is built for high efficiency, allowing up to 1,300 insulation tests at 2,500 V or 6,500 tests at 250 V on a single battery charge. With a CAT IV 600 V safety rating, an integrated voltage detection warning for circuits above 30 V, and a rugged IP40 enclosure, it ensures both operator safety and long-term durability.

Its large 73.5 x 104 mm LCD display provides clear visibility of results, and its lightweight design makes it suitable for extended field use. Powered by 8 AA batteries, the tester is engineered for maximum portability without compromising performance.

Features

• Wide Voltage Range – User-selectable test voltages: 250 V, 500 V, 1000 V, and 2500 V.
• High Measurement Capacity – Insulation resistance up to 500 GΩ for industrial and solar testing.
• Automatic PI & DAR Calculations – Quickly evaluates insulation condition without manual calculations.
• Fast, Stable Results – Delivers up to 5 mA short-circuit test current for reliable measurements.
• Extended Battery Life – Perform 1,300+ tests at 2,500 V or 6,500+ tests at 250 V on one charge.
• Enhanced Safety – CAT IV 600 V rating with built-in live voltage warning above 30 V.
• Portable & Lightweight – Compact design at 1.3 kg for comfortable field operations.
• Large Easy-to-Read Display – 73.5 mm x 104 mm LCD for clear visibility in any environment.
• Rugged Industrial Build – Designed with an IP40-rated enclosure for challenging field conditions.
• Energy Efficient – Powered by 8 AA alkaline batteries for high-performance mobility.

Includes

• Fluke 1535 Insulation Reistance Tester
• Test leads with alligator clips (red, black, green)
• Probe (red, black)
• Soft carrying case