Ozone tester's Features:
1) Use: test ozone concentration in air
2) Testing method: break off two ends of testing

Oozne tester's Features:
1) Use: test ozone concentration in air
2) Testing method: break off two ends of testing tube, and insert it into
air sampler as per the direction on the figure. Draw out 100ml of
tested air including ozone with the sampler, enabling the blue
cotton soaked with chemical medicine in the testing tube, which
is oxygenize by ozone, being changed to be white, and the ozone
concentration in air can decided from reading scale of testing
tube by the whiten length