A ruler
0.35 is close to 11/32 which means if your ruler has divisions of sixteenths, it will be between 5/16 and 6/16.
It look like 1.93
where is .39 on a ruler
0.8 = 8/10 on a ruler
2.5 cm looks like about 1 inch on a ruler
i inch
A ruler
0.73 mm would be hard to see, anywhere. If you cut up 1 inch into 35 pieces, each piece is about 0.73 mm.
1.4 cm is the same as 14 mm on a ruler
what does 3.14 look like on ruler
1.77 inches