Assuming you're talking about a glass thermometer, each mark or 'tick' on the thermometer stands for a 5 degree increase/decrease.
Most thermometers should have their degrees labeled in increments of 10, with one mark in between symbolizing an increment of 5, which is (most of the time) unmarked.
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clinical thermometer and lab thermometer
the sixth thermometer
The 'kelvin' and the celsius 'degree' are identical temperature intervals ... they are the same size. The marks on the kelvin thermometer and the marks on the celsius thermometer are the same distance apart. Both scales have 100 divisions between the freezing and boiling temperatures of water, but the scales start at different places. (Kelvin starts at 'absolute zero', celsius starts at the freezing temperature of water.) The graphs of these two scales are parallel lines. The graphs never intersect, meaning that there is no temperature where kelvin and celsius are the same number.
invantor of digital thermometer
How is a thermometer like a number line?