Excal 1000, Excal II, Sovereign GT, CZ-20, Tiger Shark, Tejon, GTI 1500, Surfmaster Pulse, CZ6a, DFX, AT PRO, Fisher 1235, Surf PI Pro, 1280-X, many more because I enjoy learning them. New Garrett Ca
I believe the only difference between the CZ7 and the CZ7a was the correction of a battery drain issue when the CZ7 was turned off? With the release of the CZ7a that issue was corrected.
Other than that I believe they are identical and the instruction manual would read exactly the same with either detector.