i have a pc60 device . i am not us it one month. after one month when i use pc60 ,result not ok. then i try to calibrate this with solution which provide by apera . but till not solve this problem . help me please
Md. al-amin
i have a pc60 device . i am not us it one month. after one month when i use pc60 ,result not ok. then i try to calibrate this with solution which provide by apera . but till not solve this problem . help me please