Active Spectrum manufactures magnetic resonance spectroscopy solutions based on our patented Micro-ESR technology. We make the world's first and only purpose-built on-line ESR spectroscopy solution! See how we apply this revolutionary technology to the online analysis of petroleum, lubricants and many other industrial sensing applications.

We offer a full line of miniature electron spin resonance (ESR/EPR) spectroscopy products in both Benchtop and Online configurations, along with custom accessories and industry-specific chemical analysis solutions. We serve the petrochemical, food, lubricants, biomedical and academic markets.

AVAILABLE NOW: X-BAND! High sensitivity in the same small form factor. Now with variable RF power (1mW-80mW).


Benchtop and On-Line ESR/EPR Spectrometers. Sample applications here.

Optimize the sensitivity and convenience of your Micro-ESR spectrometer with our full line of accessories including thin-walled sample tubes (2.3mm, 5.0mm and 5.8mm OD) and sample-loading needles (6" long in 20ga and 12ga sizes).