Chrono HT-X3006 with wifi problem

[Piotr1967]

I bought a chrono HT-X3006 with wifi last December. Despite a reset, the chrono transmits the wrong velocity value to the smartphone. The smartphone shows a value of 0.4m/s at rest. Is this a defect in the chrono ? How can it be calibrated to the real value ? Reset of chrono doesn't work by which shot velocity values are incorrect. Do any of you have a similar problem ?