The link brings up nothing containing a soil kit, and your ph meter is legit. First: Ph test your soil. Then reply.
grats u posted!how do you post?
yes, that is a little low. I buy soil with a ph of 6.5-7.0. Thats where you want to mediums ph to be @.this is what infos on the bag, the ph is 5.0-6.5 is that a little low