Difference between Breathalyser and Breathalyzer

What is the difference between Breathalyser and Breathalyzer?

Breathalyser as a noun is a device that measures alcohol in expired air so as to estimate the concentration of alcohol in a person's blood; used by traffic police in cases of suspected driving while under the influence of alcohol. while Breathalyzer as a noun is a device that measures alcohol in expired air so as to estimate the concentration of alcohol in a person's blood; used by traffic police in cases of suspected driving while over the limit.

We hope you now know whether to use Breathalyser or Breathalyzer in your sentence.