An Argon / Krypton device is different in firmware than an Argon only device. So, an Argon only device is not convertible to Argon/Krypton. We currently offer calibration of Argon-only devices at GED. Argon/Krypton devices still need to be sent to Finland. A brand–new device ships calibrated already for the first year. For future calibrations, we can covert an Argon / Krypton device into an Argon only device, so that we’re able to calibrate it at GED. It can be restored to Argon/Krypton in the next calibration, if it’s decided you want to test Krypton again.