After 2 customers reported to us that their KH reference solutions do not have the correct value, we immediately checked this and unfortunately found out that our supplier actually filled a reference solution with a 1dKH too high KH value in the batch with filling date 03/2021.
All earlier or later batches are correct, only this batch is affected.

Of course we stopped the delivery immediately and fortunately only very few bottles of this batch have been shipped so far. You can check if your reference is affected at the bottom of the bottle. There you will find a circle with the year 21 and an arrow pointing to the corresponding month 3.
For replacement, please contact us directly via our ticket system:

We apologize for any inconveniences this may cause.