Dear sir,

Thank you for your question. We only recommend calibration intervals for Vaisala products and each product has its own calibration interval, which of course depends heavily on how you are using it. I suggest you connect with one our application engineers.

You can submit a question here: https://www.vaisala.com/en/lp/contact-form
Please include the device or probe model and we will reach out to you.

Or visit the Vaisala support portal: https://www.vaisala.com/en/support-portal

Thank you!