Just got back from TX, killed a hybrid Ibex. Looks like it might be in top 5 ever with a bow, anyway. THe alkalinity will not change but I bet pH will. pH as you know has a diurnal fluctation so it depends on what time of day you take the sample and it might change in the sample bottle, unsure. The alk and hardness testing should reamin unchanged, good luck. I wish I had more time when in TX to visit some folks but speedy trip and y'll have an awesome state.