hi nodie,
i use a childs microscope, its more than good enough for the job, it lets me get up realy close, it came as a box set from my local toy store it has alsorts of different viewing bits, it was cheap as well less than 20 pounds, i have a hand magnifier that is about x 10, its ok but i can struggle a bit to see good enough, if you pick your bud a little early but nearly ripe then you will still have good smoke, if you harvest late then it will still be good, it just might be a bit of a stoner .....peace ............ happy