I bought a hana checker as well, when I tested LFS
bought salt water it had that a tad low so I bought the 7.01/4.01 solutions from them.
Recalibrated it & got nearer what I thought was right (8.1-8.2), but on testing my tank water I got 7.85!
I've been told not to worry about my PH
though whilst my tank is cycling. I don't know which model you have but my instructions told me how to recalibrate it, not that I shouldn't?
30gal tank, 20kgs Fiji + 4kgs Madagascan LR, bare bottom, 2 x Maxijets 900, AquaC Remora skimmer, 10W D&D UV using a spraybar on surface for return,Maxijet 600 + spraybar behind LR, Ecco 2234 running RowaPhos/GAC, 150w visitherm.
Custom Built lid; 2 x T5 megatwin (4x39W Aquablue+); 4 moonlights.
IKS with temp & PH probes, controlling lights,heat & cooling fans.
Percula Clown; Banggai Cardinal; Firefish; Mandarin
2 Cleaner Shrimps; 3 Peppermint Shrimps; 1 Blood Shrimp
1 Large Feather Duster; 1 Hard Tube Coco Worm; Yellow Cucumber.
6 Red Legged Hermits; 1 Green Emerald Crab; 16 Dwarf Blue Leg Hermits; 3 Zebra Hermits; 3 Popsock Hermits
22 Turbo/Astrae Snails; 20 IO Snails