The Scrapper's Hammer does not show its durability in the tooltip.
This has been reported first back in 2011 and tagged 'fixed/resolved' in 2013, but it is not fixed.
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Ok. I'm not sure how that particular tool got messed up but it's a simple incorrect variable in one of the data tables. The Scrapper's Punch also had this issue. Both will be fixed with the next maintenance on Monday.