Grasple has multiple check methods using the Computer Algebra System (CAS) which can be used within the editor to indicate when the answer of a student should be marked correct/incorrect. A full list of current options can be found in this article.
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This article covers the 'an Exact value and unit as' check. There are two sections in this article:

If you want to check whether two units are considered to be equivalent AND have the same exact form, you should use this check. This means that 1 kilogram will be equal to 1 kg, but not equal to 1 * 10^3 gram.

This check will check two properties of a unit expression:

Note: this check will not check the precision of the given expression.

The check will verify whether these properties are exactly the same (see below for links to more details). If the form of the unit expression is not important, use the 'an Equivalent value and unit as' check.

This check will consider two unit expressions to be exactly the same to each other if the following properties are exactly the same:

Do you want to know more about this check, whether you should use it for your exercise or any of the other checks? Please let us know via the chat icon in the right bottom of the screen!