The Digital Inclinometer Pro system displays readings as mm or inches of tilt, and this reading applies at the depth of the top wheels.
The Soil Standard Systems cable markers are measured from the middle of the probe, but this has some unexpected effects when the readings are
plotted:
If you use a Digital Inclinometer Pro in a Borehole that has previously been read using a standard inclinometer you will see anomalies in the data plots when comparing the previous borehole runs with the new borehole runs.
There are a number of options of how to negate these anomalies:
Option 1
Take a new datum set and exclude the previous data runs from the plot.
Option 2
Add a 250mm section of casing to the borehole which will position the new probe in the same positions in the borehole as the original probe.
the 250mm value may need adjusting for differences in cable support gates.
Option 3
Use the Depth Index adjustment feature in In-Profile to reposition the previous data sets.
See article Using In-Profile Depth Index Correction