MB Key Expert Evo is a next generation of powerful and yet very portable and simple in use tool that allows reading basic information on MB keys (FBS3/DAS3 generation only). MB Key Expert Evo reads:

number of keys
ID of key
status of a Key
number of starts being left
radio frequency
it also checks if the infrared (IR) led on key works properly.

Youtube video:

Manual:

One more extra feature that was added in a new version is a possibility to check DEC COUNT (it emulates on the turn of the key in the ignition, this way checks if the algorithm in the key works properly).

*Doesn't include carrying case. If you want with case buy

*Doesn't include BE key.