we will use travelling microscope. travelling microscope has vertical scale as well as well as horizontal scale vertical scale as well as horizontal scale.
म्हणून आपण ट्रॅव्हलिंग मायक्रोस्कोप वापरूया यामध्ये उभी आणि आडवी अशा दोन पट्ट्या आहेत.