Little disappointed - Lyman Electronic Digital Trigger Pull Gauge

I’ve had accuracy issues with this gauge. If I pull fast the reading is very low, and if I pull slow the reading increases. I’m talking about getting readings between 1 pound and 5 pounds on a single action trigger that should be about 3.5#. I’m trying to find some consistency, but I may have to go to another gauge. Maybe an old fashioned non digital.