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It depends on the type of ruler you are using. Depends if you are using a just metric unit ruler or if you are using a yard/meter stick. The measurements should be written along the edge of the ruler.
Place the ruler side by side with the object. One of the edges of the object should be in the "0" value of the ruler. Then just see where the other edge is and there you have it.
The normal size of a ruler should be 12 inches or 30cm. (30 cm=300 mm) (1 in=25 mm)
Any old Meter ruler should be fine, 36 inches is about 93 centimetres, just subtract the difference.
A ruler or scale should not be read to less than the smallest graduation. In practice, in-between measurements can be estimated but they are not significant.