Before You Start: Microscope Safety Checklist

• Carry the microscope with two hands: one hand under the base and one on the arm.
• Place the microscope on a stable, flat bench away from the edge.
• Keep the power cable tidy and away from walkways.
• Start with the lowest-power objective lens.
• Use clean slides and coverslips.
• Never force the focus knobs or objective lenses.
• Keep liquids away from electrical parts.

Parts of a Microscope and Their Functions

Microscope Terminology Explained

Understanding common microscope terminology can make it easier to follow practical instructions, use a microscope correctly and compare different microscope models.

How to Prepare a Basic Microscope Slide

Many microscope problems are caused by poor slide preparation. A clean, flat slide with a correctly positioned coverslip makes the specimen easier to focus and view.

1. Start with a clean slide.
   Make sure the slide is free from dust, fingerprints and old sample material.
2. Place the specimen in the centre.
   Use a small, thin sample so light can pass through it clearly.
3. Add a drop of water or stain if required.
   This can help position the specimen and improve contrast.
4. Lower the coverslip carefully.
   Place one edge down first, then lower it slowly to reduce air bubbles.
5. Remove excess liquid.
   Use tissue around the edge of the coverslip if there is too much liquid.
6. Place the slide on the stage.
   Secure it with stage clips and start viewing on the lowest magnification.

How to Focus a Microscope

1. Start on the lowest magnification.
   This makes it easier to locate the specimen.
2. Look from the side and lower the objective lens carefully.
   Do this slowly to avoid touching or cracking the slide.
3. Look through the eyepiece.
   Use the coarse focus knob to bring the specimen roughly into view.
4. Use the fine focus knob.
   Sharpen the image until the details are clear.
5. Adjust the light if needed.
   Too much or too little light can make the image difficult to see.

Microscope Magnification Explained

Total magnification is calculated by multiplying the eyepiece magnification by the objective lens magnification.

What Can You See Under a Microscope?

Different specimens require different magnifications. The examples below are useful for school biology, GCSE practical work and general laboratory microscopy.

Beginner Microscope Skills Checklist

This checklist is useful for students, teachers and technicians when introducing microscope practical work.

Common KS3 and GCSE Microscope Activities

Microscopes are widely used in school science for developing observation, drawing, focusing and practical biology skills.

Common Types of Microscopes

Equipment Commonly Used With Microscopes

Using the right microscope accessories can improve specimen preparation, image quality, cleaning, storage and classroom demonstrations. The products below are commonly used alongside microscopes in schools, colleges, universities and laboratories.

Cleaning and Microscope Care

• Use lens tissue or approved lens paper to clean lenses.
• Do not use fingers, rough cloths or paper towels on lenses.
• Remove slides from the stage after use.
• Return the microscope to the lowest-power objective lens before storing.
• Switch off the light source and unplug the microscope if required.
• Wrap or secure the power cable neatly.
• Cover the microscope or store it in its case to protect it from dust.

Common Microscope Mistakes and How to Avoid Them

Microscope Troubleshooting Guide

Microscope FAQs

What magnification should I start with on a microscope?

Always start with the lowest-power objective lens. This gives the widest field of view and makes it easier to find and centre the specimen.

Why is my microscope blurry?

A blurry microscope image is usually caused by incorrect focusing, a dirty lens, a dirty slide or too much light. Use the fine focus knob and clean the slide and lenses with appropriate lens tissue.

Why can’t I see anything through my microscope?

The light may be off, the slide may not be centred, the objective lens may not be clicked into position, or the specimen may not be directly above the light source.

How do I clean a microscope lens?

Use lens tissue or approved lens paper. Do not use fingers, rough cloths or paper towels because these can damage the lens surface.

What is the difference between coarse focus and fine focus?

The coarse focus knob makes larger adjustments and is useful for finding the specimen at low power. The fine focus knob makes smaller adjustments and is used to sharpen the image, especially at higher magnification.

Why does the specimen disappear when I change magnification?

The specimen may not have been centred before switching objective lens. Return to low power, centre the specimen, refocus and then increase magnification again.

What equipment do I need to use a microscope?

Common equipment includes microscope slides, cover slips, prepared slides, pipettes, stains, forceps and lens cleaning paper.

Can I use a microscope without preparing a slide?

Prepared slides can be used straight away, but fresh specimens usually need to be placed on a clean slide and covered with a coverslip before viewing.

Need Help Choosing a Microscope?

Now that you understand how to use a microscope correctly, the next step is choosing equipment that matches your application, teaching level or laboratory requirements.

Our comprehensive Microscope Buying Guide explains the differences between compound microscopes, stereo microscopes, digital microscopes, objective lenses, magnification, illumination systems and accessories.

About This Guide

This guide was written and reviewed by Better Equipped's technical team, drawing on experience supplying microscopes, microscope accessories, slides and practical science equipment to schools, colleges, universities and laboratories throughout the UK.

Our aim is to help users develop good microscopy techniques, improve practical science outcomes and get the best possible performance from their equipment. If you have any questions about microscopes, microscope accessories or microscopy in education and laboratory environments, our technical team would be pleased to help.

Last reviewed and updated: June 2026