This mod adds a durability tooltip at the bottom left of the screen and durability information in the default minecraft tooltip.
You can change settings in the config file:
#disable/enable the overlay
showOverlay = true
#disable/enable durability in item tooltips
showDurabilityTooltip = true
#durability overlay will disappear if item has no durability
toolsOnly = false
#durability overlay wont disappear if no item in hand
alwaysVisible = false
#change size of durability overlay dynamically
dynamicOverlay = true
