Bed Level Tool for TAZ 4, 5 (maybe even 3, 6).

Use a cheap dial indicator from Harbor Freight (or similar) to test your bed level and make adjustments.

I went through several designs of this before I was happy. This one fits the 10mm rods very tight and that is important so the gauge does not move.

To use both the dial indicator onto it as shown and tighten it down very tight (Because of this I recommend 100% infill). Also I print in ABS so it may be to tight on the rods if you print in PLA due to it's stiffness. Please if you print in