The HSQ Kit comes with a 4.6 x 75mm column that is used in the qualification procedure. The older version of the the HSQ Kit (called the PQ Kit) comes with a 4.6 x 150mm column instead. This difference will not affect the qualification data results and the columns can be used interchangeably. The only difference for the end-user is that the HPLC runs take much less time due to the shorter column length when using the HSQ Kit. 

Hence, this a great advantage over the older model.

HSQ & PQ Kits for HPLC Ordering Information