TRV temperature setting?

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In a hotel, Honeywell TRV marked 0 - 6 how does one know what is 20ºC? Even if degrees F one would stand a chance, at home my eQ-3 are marked in centigrade, so not use to 1 - 6, it means nothing.
 
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Trvs are not calibrated very accurately but I would guess about 3.
 
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Most/all of mine are calibrated 0 to 5 and a setting of 2.8 ish gives me 20/22C.

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If in my own home I would soon work it out, but on holiday for 5 nights, not really worth the effort. I know I want room at around 68F or 20C, -32 x 5 / 9 easy enough.

But * 1 2 3 4 5 6 means nothing to me. Seems now set to 2 maybe 2 stands for 20 would it be so hard to show in degrees C?
 

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