***neither a teacher nor a native-speaker***
We'd be grateful if you elaborated why you think the article contains some mistakes.
If you try and correct them first, our members will be happy to help. Is this an article of yours or did you find it somewhere else? It would be of help to know the mother language of the author.
Let me start with your own sentence.
There is no such thing as "There is mistake"; "there is a mistake." or "there are (some) mistakes." are OK. "Is there a mistake?" or "Are there any mistakes?" are OK too.
And about the first two questions ;
The first one should be;
How reliable is your data? (But some people may beg to differ whether it is "is" or "are" since they think that the word "data" is plural, so there should be "are" instead of "is". As far as I'm concerned, "is" is OK. )
As for the second one;
Do you calibrate your equipments?
Wow, if your factory has such a capability, it is awesome. But mostly it is not the case. Calibrating work is done by the labs that have been granted the required accreditation certificates by the relevant institutions (or those institutions themselves may do the job as well). So, in light of the facts I have just mentioned the question should be;
Do you have your equipments calibrated? or,
How often do you have your equipments calibrated? or,
How often do you sent your equipments for calibration?
Ok, it is now your turn. Check the whole article and mark the mistakes ( or what you regard as mistakes). Remember that our members are here for you to make a contribution
to your learning process not for your articles to correct them. The article can only be a mean to help improve your English learning, the article itself is not our concern.