I second the Delica - much gentler on little fingers! My daughter was 2 when she was diagnosed and for her, the secret was bandaids. She didn't mind injections but did not like blood checks. So...we went to the store and she picked out a few boxes of characters she liked and we ended up with all sorts of bandaids. We did a lot of forearm testing in the beginning and she'd have rows of bandaids that we'd peel off every other day and she'd start over. People, seeing her arms, started giving her fun bandaids and she did this for months and months. At daycare, all the kids would help her pick one and she loved that whole 'center of attention' thing. Not sure if it would appeal to a 4 year old but it made life a whole lot easier for us! Also, they gave her a doll in the hospital and she took a click pen and tested the doll. Poor thing is still in my closet - blue ink all over her face and arms and hands. Having a doll that she could test also helped. If she's into dolls, perhaps choose a doll that also has diabetes and let her check it.