Lesman Instument Co.

RAECO is now Lesman.

Since 2001, RAECO-LIC LLC has been a part of the Lesman Group. Effective January 1, 2018, RAECO merged with its parent, Lesman Instrument Company to provide you a single source for your detection, analysis, process measurement and control instrumentation needs.

What does this mean for you?

You'll be able to work with the same factory-trained team, but with access to more brands and an expanded product offering. Because we've been operating out of shared offices in Illinois and Wisconsin, our address will not change. All existing methods of reaching RAECO will continue to operate as usual, and this website will stay active till the new Lesman site launches later this year.



We're honored to be your chosen supplier for

Honeywell Analytics  Ion Science  TSI Quest Technologies (was part of 3M Detection Solutions)  Siemens Industry Inc  Testo US  Panametrics  RAE Systems  ABB Analytical Measurement  Alfa Laval  Alnor, a TSI Company  Applied Analytics  BW Technologies by Honeywell  Crouse-Hinds by Eaton  E Instruments  Elkins Earthworks LLC  Gasmet Technologies  Grimm Technologies  Inficon (formerly Photovac)  Interscan Corp  International Sensor Technologies  K-Patents Process Refractometers  Morphix Technologies  PCME  PermaPure  PID Analyzers  s:can Water Monitoring Systems  Senscient  Sensidyne (and Gilian)  T S I Inc 



Air Sampling and Monitoring Instruments
Air Sampling & Monitoring

Emissions Monitoring and Combustion Efficiency Instruments
Emissions Monitoring &
Combustion Efficiency

Fixed Gas Detection and Monitoring Systems
Fixed Gas &
Flame Detection

Noise Exposure Monitoring and Area Sound Level Metering Instruments
Noise Exposure &
Sound Level Monitoring

Personal and Portable Gas Detection and Monitoring Instruments
Portable & Personal
Gas Detection

Process Gas Analyzers
Process Gas Analysis

Silica Dust Exposure Monitoring
Silica Dust Exposure Monitoring

RAECO Field Service
Field Service


What Makes RAECO Different?

Whether your goal is improving employee health and safety, reducing energy costs, improving compliance reporting, or optimizing your process — the staff at RAECO can help you get the most value out of your analytical and detection instrumentation.

  • Exclusive local representative for 3M Detection, Honeywell Analytics, GE, Siemens Process Analytics, ABB, Gasmet Technologies, RAE Systems, TSI, Sensidyne Gilian, TESTO, and more.
  • With more than 40 years of experience in analysis and detection, we'll help you identify the best technology for your application, integrate it with your current systems, and provide start-up training and commissioning.
  • Factory-trained service team provides routine sensor calibration and gas detection system functional testing.
  • Anytime access to free video training, educational webinars, user manuals, software, and technical tips.
  • Secure ordering in our online store. All orders of $500 or more qualify for free UPS Ground shipping.
OSHA Rule for Crystalline Silica Exposure Monitoring in the Workplace

Keep workers from breathing crystalline silica dust

  • Train workers on silica risks and how to limit exposure.
  • Monitor exposure and reduce workers' exposure limits (PEL) for respirable silica to 50µg/m³ air, averaged over an 8-hour shift.
  • Use engineering controls (water or ventilation) to limit exposure; provide respirators; limit worker access to high exposure areas; establish an exposure control plan.

OSHA's Crystalline Silica Rule construction industry compliance deadline is approaching soon. Are you ready?

Learn more about OSHA's crystalline silica rule