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Depth Gauge
The only module the mod adds as its own item. It shows Y levels in the picture.
S N S = stick
S N N = copper nugget
S N
Three sticks in a column, three copper nuggets beside them.
Put it into a module slot (sneak + right-click with the CRT). A white ruler appears along the left edge of the picture with the Y level at your feet and a mark every 8 blocks above and below. Handy for strip mining at the right level and for knowing how far down an ore or cave is.
It works in any CRT with a free slot, from the Copper CRT on.