Does it include a instruction manual?

Hello, there are instructions in it

Does it need immersion oil for the higher magnification to not be blurry?

Hello, the objective lens is divided into 41040100 standard configuration. Generally, it ends at 40. 90% of the specimens can be seen, and a few specimens need 100 times the objective lens. There is no need to use oil for the objective lens less than 40 times, because the multiple is not very large. Only 100 times of the objective lens needs to use cedar oil, which drips on it to increase its refractive index.

ASIN	B098TFBCS4
Best Sellers Rank	#1,835 in Camera & Photo Products ( See Top 100 in Camera & Photo Products ) #22 in Lab Compound Binocular Microscopes
Date First Available	July 7, 2021
Item Weight	4.99 pounds
Item model number	1
Manufacturer	BOGRINUO
Product Dimensions	11.47 x 15.35 x 7.08 inches

BOGRINUO Compound Binocular Microscope, WF10x and WF50x Eyepieces,40X-2000X Magnification, LED Illumination Two-Layer Mechanical Stage

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