The DPD test kit (most) will render results for both free chlorine and total chlorine. Combined chlorine is then simply total less free.
Well, that's pretty darn close. Actually, the FAS/DPD test measures FC first and, in a second step, measures CC's. Adding the results of the two gives TC.

I have no idea how I would effectively manage my water without Ben's kit.....he might have to do one of those "priceless" commercials.