Worth your/its salt
Definition 1 of 1
Pro Tip 1/3Professionalism
Used to praise or expect a high level of professionalism and expertise in someone's job or role. 
A lawyer worth her salt will fight tirelessly for her client's rights.
Pro Tip 2/3Value Acknowledgment
Indicates recognition of someone's value based on their ability to perform well in their duties. 
A mechanic worth his salt can diagnose a car problem just by listening to it.
Pro Tip 3/3Expectation Level
Sets a standard one would expect from a capable person in their field or activity. 
Any chef worth their salt knows how to prepare a perfect omelette.