Here's the calibration instructions:
Unwrap meter from packaging.
Sort plastic from paper inserts.
Recycle according to your town's recycling program. The meter can just go in the trash.

Sorry... I couldn't resist. Hanna makes crappy products.

Okay. The reason there are 2 values, 6.86 and 7.01, is that the NIST buffer 'neutral' is actually 6.86. (.025 molar disodium phosphate at 25'C is pH 6.86). You have to hit the 'mode' button during the calibration to tell the meter you are using the NIST buffer set (4.01-6.86-9.18) instead of the more common 4.01-7.01-10.01 buffers.

So read the packaging on your calibration standards to see which calibration mode you will need to run.