I am using the code:
SELECT a.[Unload Device], a.[Scanner Position], a.[Serial #], a.[Model], a.[Tested By], a.[Test Date]
FROM [Unload Inventory] AS a
WHERE (((a.[Test Date])=(Select Max([Test Date]) from [Unload Inventory] where [Unload Device]=a.[Unload Device])))
ORDER BY a.[Unload Device]...