The phrase "black counters" means people who keep track of something and can tell you information about it.
Sentences with «black counters»
The shiny black counter tops were my biggest challenge in working through a design concept and are now a lovely feature of our kitchen. (creeklinehouse.com)
I was dead set on dark, possibly black counters but the way you are using white is giving me second thoughts. (theinspiredroom.net)
Makes me wish I had opted for black counters around my perimeter. (classiccasualhome.com)