I need a stylus that works with ipad 4md513ll/a

Only easily found anywhere, commonplace capacity stylii will work with that old an iPad.

Ones with fatter, rubberised tips or ones with a flexible disc tip.

OR

The so-called, fine tipped “Active”, battery powered ( most times rechargeable battery powered ) capacitive stylii, like many found on Amazon.

These fine tipped, “Active” stylii use a battery to send a tiny electrical current to the fine tip of these stylii that simulates an actual finger touch to the iPad's screen.

These types of stylii are not the greatest and many of these produce varying degrees of noticeable line jitter when drawing any type of angular lines.

Some of these “Active“ stylii do a better job at minimising this angular line jitter than others, but I have no idea which ones do minimise this better, so if searching for one of these on Amazon, you will need to read the reviews.

Also, still need to make sure that these “Active” battery powered stylii are compatible with your IPad model.

Some of these, especially new to market ones, are NOT!

All of these these types of stylii work with all sketching/drawing/painting/writing apps, but without any palm rejection and/or screen pressure features.

You can use this stylus with other apps but will not be able to lay your palm on the screen, while you write or draw, unless you use special, non-body electrical conducting, lycra-based material drawing glove that works by isolating your hand/palm electrical impulses from the iPad's screen and allowing you to lay your hand/palm on the screen as you draw or write.

Something like this found on Amazon.

https://www.amazon.com/Professional-Anti-fouling-Drawing-Tablet-Graphic-Right-Ha nd-Left-Hand/dp/B017R8M2JY/ref=sr_1_1_sspa?ie=UTF8&qid=1543548123&sr=8-1-spons&k eywords=lycra+drawing+gloves&psc=1

Many more makers of these types of gloves found on Amazon and in different hand sizes and limited colors, as well!

Best of Luck to You

Your average generic rubber tipped stylus will work for generic tapping.

As to others you can search on Adonit or Wacom’s site and see if a model that does what you need it to do is compatible with your model ipad.

You already have the very best stylus for your iPad4 - your finger. Other than the Mk1 Finger, a passive/capacitive stylus will provide exactly the same functionality.