Good to know about the probe, but I agree with LoJ On my side of the fence, things are chugging away. For the past month, my values have been extremely stable. I've had a max deviation of .46 dKH with an average of .03 dKh recorded between tests. That's comparing the last 286 tests. I've had no re-tries recorded in that timespan as well. I am probably jinxing myself writing this post, but it should be worth recording. I also finally did a comparison with my hanna and idip and the values were perfectly in sync from when I did the reverse calibration. 2/24 Alk Hanna 140, 140 Idip 126, 128, 124 Khg 162, 163, 3/18 Alk Hanna 142,140 Idip 7.12 (127) Khg 7.82 (140) Keep in mind as well that I've been adding some ability for my controller to adjust alk slightly in order to try and stall swings. The KHG and this program has helped me adjust my dosing baseline from where I started 18ml/day to where I ended up needing to be at 30ml/day.