Working way:
new timid[2];

public OnFilterScriptInit() {
	timid[0] = SetTimerEx("test2", 10000, 1, "i", 1);
 	timid[1] = SetTimerEx("test2", 5000, 1, "i", 2);
}

public test2(number) {
        printf("%d, %d", number, timid[number-1]);
	KillTimer(timid[number-1]);
}

Prints the timerid properly and kills the timer.