I'm sorry to hear your DISTO is out of calibration. Though rare, it happens.
If your E7400x is still under warranty, we will replace it with a new X3 (the E7400x has been discontinued).
If it is not under warranty, you can purchase an X3 at a reduced price.
Please shoot an email to [email protected]. If you have a copy of your receipt or order confirmation with a date of purchase, please include that along with your contact info.