Temperature

Correction to the last figure 

Of the reading obtained

10°C (50°F)

Subtract 0.6

15°C (59°F)

Correct

20°C (68°F)

Add 0.9

25°C (77°F)

Add 2.0

30°C (86°F)

Add 3.4

35°C (95°F)

Add 5.0

40°C (104°F)

Add 6.8