expensive but accurate

[navi tasan]

1) That watch isn't expensive, but accurate.
2) That watch isn't expensive but accurate.

Which means:
a) It is not true that that watch is expensive but accurate. (That watch is not 'expensive-but-accurate'.)
and which means:
b) That watch is not expensive, but it is accurate.

Gratefully,
Navi

 

[tedmc]

Wouldn't it be more logical to say:

That watch is expensive but accurate?

 

[teechar]

b) That watch is not expensive, but it is accurate.

You can use that. You can also say, for example:

That watch is (very/quite/pretty) accurate and inexpensive (too).

 

[teechar]

Wouldn't it be more logical to say:

That watch is expensive but accurate?

No. That's different from the OP's idea.

 

[GoesStation]

1) That watch isn't expensive, but accurate.
2) That watch isn't expensive but accurate.

Which means:
a) It is not true that that watch is expensive but accurate. (That watch is not 'expensive-but-accurate'.)
and which means:
b) That watch is not expensive, but it is accurate.

Both sentences are ungrammatical.

 

[Tdol]

b) That watch is not expensive, but it is accurate.

This is the way to say it.