If you have an employee who is a genuine wanderer, it is completely acceptable to place him under managerial microscope. Micromanagement can be effective for some employees, dependent upon their needs, work style, and abilities.
At the same time, if you are micromanaging all of your employees, perhaps it is more a function of your needs, work style, and abilities. If this is the case, you may actually be causing some of the wandering.
Having received feedback from an employee who believes he is being micromanaged, this may be a good time to look into your managerial style. For example, as you indicated, your employee feels that you are "checking up" on him. Checking up on an employee is different from managing, in much the same way that nagging is different from coaching. In your follow-up with this individual, it will be important to include opportunities for two-way communication, along with coaching, guidance, feedback, and tools to help him meet the agreed-upon objectives. And, one of these objectives should be for him to work more autonomously.
If he continues to be a wanderer rather than a worker, he might just wander right out of the company.
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