Timer class now working properly in Wemos_mini_D1

[il-gen]

When I set timer using --Timer timer(t_s)=std::round(1e6 / f_s);-- it seen not working properly.. I added a time control line: now = micros(); diff= now-last; if (timer){ // returns true once every (1/f_s) sec, determines sampling frequency last = now; Serial.println(diff)); but result show me Timer class time constant smaller than expected.. (Actually <AH/Timing/MillisMicrosTimer.hpp> librarry is well structured but i cannot understand what is going wrong?)