Microseconds Resolution Time Counter

If you're an electronic hobbyist, you might want to roll your own.

First, you need a clock circuit, preferably crystal controlled at 1 MHz. Here is one made from a 74LS00 Quad NAND gates that has an On/Off control for your start/stop signal.

http://www.next.gr/oscillators/crystal/IC-compatible-crystal-oscillator-l11963.html

http://www.next.gr/oscillators/crystal/

You want to feed your clock output into the clock input (pin 14) of the first of a series of nine 74LS90 decade counters, one for each digit of 000.000001 to 999.999999 seconds. Each counter IC outputs BCD (binary coded decimal) which can be decoded to drive a 7 segment display. (0000, 0001, 0010, ...,1001, 1100.)

Each stage output (pin 11) feeds into the clock input of the next stage (pin 14).

Each decade counter is connected to a 7 segment driver chip which connects to a 7 segment display. Q_A, Q_B, Q_C, and Q_D feed A, B, C, and D.

(The first counter and display will be the rightmost digit.)

https://www.electronics-tutorials.ws/counter/bcd-counter-circuit.html

My advice is to get a breadboard that you can plug in DIP ICs and other components and verify that it is working as you intend. You can clock it slowly to verify the counters are operating properly.

I hope this is helpful...

Why not make one?

Just buy FPGA dev kit like this

https://www.amazon.co.uk/Hobby-Components-Ltd-Cyclone-ES2C5T144/dp/B01LYHVEJ0

You'll also need a USB blaster and PSU.

And a 12 digit LED/LCD display: three of these would do:

https://www.rapidonline.com/Kingbright-CC56-12SRWA-4-Digit-Red-LED-Display-57-0268?IncVat=1&pdg=pla-339728974988:kwd-339728974988:cmp-757438067:adg-44804851896:crv-207912323492:pid-57-0268:dev-c&gclid=CjwKCAiAlvnfBRA1EiwAVOEgfI8Lwmd5iH8605MkTs77ZjO0ZUUhxtl04DF3b9CWzlBuV-Ns9dWcORoC9FEQAvD_BwE

Sorry about the UK search but you get the idea.