To be honest I only got it as i use a 1.5:1 carb ratio at times, not a 1:1, so I dont really use it for the digital display only for the half units. But my experience so far has been good the display tells you how many units you last took and how long ago and it dpoes half units, which I haven't worked out what the time segments stand for but i am sure its in the instructions somewhere, other than that it is pretty much just a novo 4. Comes in a nice blue colour too