Correction Factor for Thermometer

[Sunjay]

Can anyone suggest me how to apply correction factor for calibrated thermometer.

The observed value for a thermometer with range -10 to 110° are, for example

Actual 0.0°C Observed 0.1°C
Actual25.0°C Observed 25.2°C
Actual50.0°C Observed 50.3°C
Actual75.0°C Observed 75.0°C
Actual100.0°C Observed 100.1°C

In one guideline i read that thermometer should be calibrated for minimum 5 equally space points.

So if we calibrate thermometer for above points how the correction factor will be applied?

Since calibrated from 0-100, can we use this thermemeter for less than 0 and more than 100, if yes what will be correction factor?

If any referance availableon net pls share.

Regards

[DR]

25.2 & 50.3°C? If you're certain about those two numbers, I'd buy a new thermometer!