The A-21ZX Ozone Sensor  can also accurately measure ozone levels in occupied spaces.

It also has the ability to monitor ozone levels far above those recommended for occupied spaces, such as in the case of ozone disinfections.
It features a precise digital readout.

It constantly monitors ozone levels by displaying them on a multi colored bar graph. 

The green,  yellow, and red bar graph is easy to read and is easy to understand by non technical personnel.

Operable from AC power, or the rechargeable internal batteries. 

FEATURES:

Accurate Range of 0.02 - .14 ppm. 

Bar graph: 
Green - Normal levels
Yellow - 0.05ppm Moderate levels
Red - 0.1ppm High levels

Powered by self contained long life rechargeable NiMH batteries, or the supplied AC adapter.
Battery life: 8 hours

Measurement Principle: Metal oxide semiconductor. 
Response time: within 10 seconds. 
Physical dimensions: 3 1/4" x 1 3/8" x 2 3/8"
Weight: 6 ounces 
CE approved

EZ-1X
Price $329.99

It can monitor levels up to 10ppm which makes it perfect in areas where ozone is being used to disinfect such as mold remediations.

The design combines the latest solid state sensor technology. 
The A-21ZX warms up quickly and requires no zeroing or adjustments. 

FEATURES:
Accurate Range of 0-10 ppm. (reads up to 19ppm)
Digital readout in 0.01 ppm increments. 
Range: 0-10 ppm. 
Sensitivity: as low as 0.02 ppm.
Easy calibration.
Pocket sized - easy to use
Powered by self contained long life rechargeable NiMH batteries, 
or the supplied AC adapter.

Measurement Principle: Metal oxide semiconductor. 
Response time: within 10 seconds. 
Physical dimensions: 2" x 4" x 1" , Weight: 6 ounces 
Temperature Range: 32 -104 F (0-40 C) 
CE approved

Supplied with a carrying case and an the AC adapter / charger. 

Eco Badge® Ozone Detector Cards provide a low cost alternative to ozone meters for ensuring that an environment is within accepted safety standards when using an ozone generator, or any other place where ozone levels are desired to be monitored. These patented ozone test cards were originally developed for NASA. Each kit contains two separate, one hour tests in vacuum packed pouches.

These test cards are very easy to use. Just open up one of the sealed pouches and take out the test card and tape it to a wall or any other convenient surface.

After one hour you match the color of the card to the colors on the colormetric strip to determine the ozone level.  They couldn't be any more easy to use.
 

Ten Ozone Detector Test Card Kits Price $41.99