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Quick answer
Send a correction, a question about a calculation, or a partnership enquiry through the form below. Corrections to a number get priority over everything else.
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Corrections
If a figure on this site is wrong, tell us which page and which number. Arithmetic errors get fixed the same week. Specification errors need the listing or the manual that contradicts us, and those get fixed as soon as we can check the source.
What we cannot help with
We cannot tell you whether a specific machine will help a specific person's symptoms. That is a medical question and it belongs with a doctor. We also cannot diagnose a building: damp, poor ventilation and combustion problems need somebody standing in the room.