Environmental Sensors Co.'s Ozone Meter is a hand held instrument that measures ozone concentration in a range of 0-2 ppm and a resolution of 0.01ppm.
The instrument makes it possible to monitor ozone vapor in air. The insturment has an LCD display giving concentrations in ppm, a low battery indicator, and an audible alarm that can be set at any level from 0-2ppm.
With the touch of a button, the meter displays STEL (average of every 15 min.), TWA (8 hour average) and Peak.