How can I measure Duty cycle ?

[MaxiBoost]

Hello friends ,

I`m trying measure my cars injectors duty cycle .
Have any body experince about this ?

For example ,
injectors running pwm cycle ,
if injectors full open ,I must see %100 duty cycle on the display.

Im trying measure injectors cycle (ms) than calculate duty ,
but this is not correct way I think .

This kit ,
http://www.jaycar.com.au/productView...=&SUBCATID=347

working great ,They are use a 16F84 pic only .

thanks