If
you are on iOS 10 or later, you can use your iPhone as a Magnifying Glass with
magnifier by triple tapping your Home Button.
Apple
has added lots of features and functions on iPhone and iPad which can be used
in our daily life like camera, calculator, flashlight, stocks and more.
Likewise with the introduction of iOS 10 Apple added a magnifier function which
can use your iPhone as a magnifying glass.
If you are on iOS 10 or later, you can use your iPhone as a Magnifying Glass with magnifier by triple tapping your Home Button.With the iPhone’s magnifier, you can magnify an image to see its clarity right from your iPhone
With
the iPhone’s magnifier, you can magnify an image to see its clarity right from
your iPhone. 
Magnifier of iPhone lets you use your iOS devices camera to
quickly magnify things. Similarly you can enable flashlight, photo filters from
the magnifier. If you have any object and want to use magnifying glass then you
can use your iPhone as a magnifier only from iOS 10 or later. To start
magnifier, and quickly magnify any things triple click the Home Button of your
iPhone or iPad.
How
to Use your iPhone as a Magnifying Glass on iOS 10, 10.1.1, 10.2, 10.3, 10.3.1
Step 1# To turn on the iPhone magnifier on iOS 10, go to Settings app
Step 2# Tap
General & Select Accessibility.
If you are on iOS 10 or later, you can use your iPhone as a Magnifying Glass with magnifier by triple tapping your Home Button.With the iPhone’s magnifier, you can magnify an image to see its clarity right from your iPhone

Step 3# Tap
Magnifier and toggle on the switch.
If you are on iOS 10 or later, you can use your iPhone as a Magnifying Glass with magnifier by triple tapping your Home Button.With the iPhone’s magnifier, you can magnify an image to see its clarity right from your iPhone

Step 4# After
you have done, triple press your Home button.
Step 5# The
magnifying glass will automatically open so that you can magnify any objects
with your iPhone.
If you are on iOS 10 or later, you can use your iPhone as a Magnifying Glass with magnifier by triple tapping your Home Button.With the iPhone’s magnifier, you can magnify an image to see its clarity right from your iPhone

Note:
If you have enabled multiple Accessibility Shortcuts, a menu will pop up &
Choose Magnifier.
There
you can see many options like zoom in out, photo filters, flashlight and more.
iPhone
magnifier
works great and I recommend you to enable magnifier to magnify any
things you need with quickly and easily.
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