RG55 – GPS MegaTape - Tape Measure Review

I've attempted to calibrate this as per instructions, however, I get conflicting measurements every time. I walk a preassigned distance, then backtrack the exact distance but get two different results each time. I measure only when "light" is green only. BTW, light only comes on when outdoors only.
Review by Rengarcia7 on GPS MegaTape - Tape Measure.