What is the simple subject of sentence check height net for me please?

The simple subject of the sentence "Check height net for me please" is you.

Here's why:

* Implied Subject: The sentence is an imperative sentence (a command). Imperative sentences usually have an implied subject, which is "you".

* Action: The sentence is asking someone (you) to perform the action of checking the height net.

Therefore, the subject of the sentence is "you," even though it's not explicitly stated.