Greenlee^® Introduces IT-5 Insulator Tester for Fast, Reliable High-Voltage Testing in Transmission Work

Next-generation tester delivers clear visual and audible feedback for confident decision-making

ROCKFORD, Ill. (August 17, 2026) — Greenlee^®, part of Emerson’s professional tools portfolio, introduces the IT-5 Insulator Tester to help transmission crews quickly assess high-voltage insulator condition with confidence. Building on Greenlee’s legacy in high-voltage insulator testing, the IT-5 brings next-generation capability to a job where accuracy is critical and delivers immediate, reliable feedback in the field.

The IT-5 detects internal dielectric failures in porcelain and glass suspension insulators and detects surface contamination on all types, including porcelain, glass, and polymer/composite. Insulator degradation can lead to outages, equipment damage and significant safety exposure, making accurate testing critical to maintaining system reliability and worker safety. Crews use the IT-5 during maintenance, inspection and installation work to verify insulator performance before continuing line operations.

“High-voltage insulators play an important role on transmission lines by preventing electricity from traveling where it shouldn’t,” said Ryan Berg, director of product management at Greenlee for Emerson. "The IT-5 gives crews a simple way to check insulator integrity in the field, helping them spot potential problems quickly with clear visual and audible cues that make the tool easy to learn and use."

Built for the Way Crews Work

Designed to fit existing crew workflows, the IT-5 works with universal spline and shotgun sticks and requires no additional setup. Key features include:

• Clear Go/No-Go Readout - LED indicators and an audible tone provide immediate results, helping crews make the call and keep work moving.
• Simple to Use - A one-button interface with clear at-a-glance feedback supports fast adoption with minimal training.
• Balanced, Lightweight Design - Improves handling on a hot stick and reduces fatigue during repeated checks
• Recharge and Keep Working - A USB-C rechargeable battery supports longer runtime and convenient charging in the truck or at the yard/shop.
• Easy Fleet Upgrades - Backward compatibility helps utilities upgrade without replacing existing accessory probes.

  By delivering quick, easy-to-understand results, the IT-5 helps crews perform repeated inspections efficiently and confidently. For utilities, its simple operation also supports more consistent testing across crews and fleets without adding unnecessary complexity.

  Learn More

  Visit Greenlee.com to learn more about the IT-5 Insulator Tester and Greenlee’s high-voltage testing tools. Find a local Greenlee distributor by visiting Greenlee.com/where-to-buy.

  Emerson’s professional tools business includes Greenlee as well as the RIDGID^® and Klauke^® brands and provides the industry’s broadest portfolio of advanced, reliable tools and technologies for the mechanical, electrical and plumbing trades globally. Visit emerson.com/professionaltools for more information.

  About Greenlee

  For more than 150 years, Greenlee has been delivering electrical, utility and industrial tools that improve safety, ergonomics and ease of use for trade professionals. As part of Emerson’s professional tools portfolio along with RIDGID^® and Klauke^®, Greenlee delivers reliable solutions designed to perform in the toughest conditions worldwide. For more information, visit Greenlee.com.

  About Emerson

  Emerson (NYSE: EMR) is a global technology and software company providing innovative solutions for the world’s essential industries. Through its leading automation portfolio, including its majority stake in AspenTech, Emerson helps hybrid, process and discrete manufacturers optimize operations, protect personnel, reduce emissions and achieve their sustainability goals. For more information, visit Emerson.com

  Greenlee^®, RIDGID^® and Klauke^® are trademarks of Emerson or its subsidiaries. All other trademarks belong to their respective holders.

   

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  For more information, contact:

  Agency Contact:  Jennifer Hickin ▪ 216.912.2865 ▪ [email protected]

  Corporate Contact: Maddie Gamble ▪ 440.864.9357 ▪ [email protected]