Timer in fractions of a second

How can I run a timer in fractions of a second, also display tenths of a second?

The decimals parameter to 1...

i try to set 0.1 but that go down slow not in 1/10 of secound

Well... a little unexpected but if you choose step of 10 then that means 10 times a second. And set decimal to 1. However, I tried decimal to 10 and step of 100 and it did the same as 10 and 1. But... for now, the step of 10 and decimal 1 will probably give what you want.