E Instruments proudly presents our brand new Zero Filter Attachment. This filter attachment allows for a much more accurate zeroing of our VOC gas sensors. The filter removes all of the VOC’s and other toxic gases (Except CO2) from the ambient air and allows the instrument to properly measure the zero point for the VOC’s gas sensor. Once the filter is removed, the instrument will read a much more accurate VOC reading. Please contact us to learn more about this new Zero Filter Attachment.