When Sector Z is first introduced, the hands of Bruce, the blonde boy, are bare. A few seconds later in the same scene, he is wearing black gloves, which he continues to wear for all of his subsequent appearances as a Sector Z operative. See more
Here we are. Behold, my greatest invention!
Uh, that just looks like a calculator.
FOOOOOLS! This is a KNDNA tracer. With just a tiny trace element of DNA - an old chew of gumwad, sweaty sock or booger it can track anything! Even the true identity of Numbuh ZERO!... And, yes, it's also a calculator.