Is it necessary to cover the fragment for the use of the microscope?

Is it necessary to cover the fragment for the use of the microscope?,
cover glass, Laboratory slide coverslip, microscope glass,

The answer is sometimes yes, sometimes no, depending on the type of preparation and the requirements of the microscope.
The most critical information can be found on the inscription on the objective lens. What do the bunch of things marked on the microscope objective lens mean?
1. The type of objective lens:
APO: Apochromat Objectives
FL: Fluorite objective lens
PL or Plan: Plan Objective
2. Magnification: This is generally the most conspicuous number. Most manufacturers will use color to distinguish objectives of different magnifications
3. Numerical aperture: usually 0.25, 0.65, 1.3, etc.
4. Standard mechanical barrel length: usually 160, 170 or ∞
5. There are three cases where cover glass is required:
The first type: if a cover glass is required, the thickness of the required cover glass will be indicated, such as 0.17.
The second type: No cover glass is required (and no cover glass is allowed), and a 0 or no mark will be marked
The third type: it doesn’t matter whether it is covered or not, it will be marked with “-”
6. Immersion system: if it is an oil lens, there will be the word “oil”

Product details

Product description

A cover glass is a thin, flat piece of transparent material, usually square or rectangular, about 20 mm (4/5 inch) wide and a fraction of a millimeter thick, placed on an object observed under a microscope. The object is usually placed between the cover glass and the slightly thicker microscope slide. The microscope slide is placed on the platform or sliding block of the microscope and provides physical support for the object and sliding.

Features

Made of borosilicate 3.3 glass or soda-lime glass, which is chemical and stains resistant.

Featuring special surface treatment, good toughness and high cleanliness.

With uniform flatness and sizes.

Available in various dimensions and specs.

Specifications

Package and Shipping

Payment:
VISA, MASTERCARD, T/T, PAYPAL, WESTERN UNION, ALIBABA TRADE ASSURANCE

Packing
Standard carton packing for international shipping

Shipping:
Shipping either by express, air,sea, or land as per your preference
UPS,DHL,FedEx, EMS, etc. for you to choose from
EXW, FCA, FOB, CFR, DAP, DDP, etc. available as your request