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About Filter Minder®

Our Purpose:  Exceed the filtration monitoring needs of our customers through innovative leadership.


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Expertly Monitoring Filters for Over 35 Years

Invented in 1977, Filter Minder® pioneered the market for filter monitoring products.  Engineered Products Co. gained early support from OEMs and their Tier One suppliers that appreciated the durability and accuracy of Filter Minder® products in demanding under-the-hood environments.  Capitalizing on its prime mover advantage and the success of its initial products, EPC subsequently introduced a full line of indicators, gauges, switches and sensors.  Owing to the depth of its engineering talent, the company has received fifteen patents, with three additional patent applications pending.  

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In August 2015, Donaldson Company, Inc. acquired 100 percent of the shares of Engineered Products Company.

“The acquisition of Engineered Products supports our strategy of technical leadership in filtration products for both our OEM Customers and their end users of our filters,” said Tom Scalf, Donaldson’s Senior Vice President for Engine Products. “We see an increasing need for measuring and monitoring filter life in diesel powered equipment, and communicating filter status information visually, electronically and remotely as vehicles become increasingly connected with fleet management systems. The information from Filter Minder® products helps equipment operators maximize the performance and uptime of their equipment, and plan their filter changes.”

About Donaldson Company

Founded 100 years ago, Donaldson (NYSE: DCI) is a global leader in the filtration industry. The Company's innovative filtration technologies improve people's lives, enhance Customers' equipment performance and protect the environment. More than 12,500 employees support Customers at 140 sales, manufacturing, and distribution locations. For more information, visit www.donaldson.com.


Filter Minder® Gauges, Indicators, Switches and Sensors can be found on applications throughout the world.



The market-leading Filter Minder® line of filter monitoring products are used chiefly in diesel engine applications, monitoring the restriction of air filter and fuel filters across a variety of end markets including light, medium, and heavy duty trucks, off-highway vehicles used in construction and agriculture, and select military vehicles. No other company worldwide supplies a line of products for monitoring air and fuel filters that is more comprehensive and reliable.




Filter Minder®  /  2940 Airport Blvd. Waterloo, IA 50703  /  P: (319) 234-0231  /   F: (319) 234-8922filter-minder-quality-certifications


Committed To Quality