Knowledge pays off: answer 3 questions correctly and receive the 20% discount code.
Until October 15th you can earn a 20% shopping cart discount voucher for our online shop by answering the following questions correctly. Simply answer the following questions correctly and enter your email address. As long as all questions have been answered correctly, we will send you your personal voucher code from October 16th.
Need some help answering the questions?
Our article "Breathing air quality monitoring" could provide helpful information :)