Counting Pen Wanted Colony Counter,

I am looking for a stylus that can count the number of times it has been touched to a surface. This is a type of colony counter. It might look and work something like the product you can find as product 3133 at Control Company (control3 dot com).

I need it to count to at least 9999. I am initially interested in purchasing 10 units for testing. Then 500 units in 2 months time. Then hopefully larger quantities in future months. For the first order, the packaging and branding should be nondescript. For future orders, I would like to work with you to create branded product and packaging.