Cramer's lightning round: Start a position in DexCom

• It's that time again! "Mad Money" host Jim Cramer rings the lightning round bell, which means he's giving his answers to callers' stock questions at rapid speed.

DexCom: "Let's start a position in Dexcom if we haven't owned it."

NIU Technologies: "I have to do more work on NIU, but I know that they are the premier scooter maker."

Quidel: "I like the diagnostics segment so much. ... I think Quidel's good. I think you've got a winner. I like that stock."

Gan Ltd: "I can't figure this one out"

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