OK, let me go through it here. I attached a screen shot of what I brewed this last Sunday so I can reference the numbers and you can follow.
1st column: Mash pH and Runnings
Measured Mash pH -- This is the pH of the wort I measured once I mashed in. Sample was cooled to room temperature before taking a reading. My measured pH was 5.26.
Sparge Runoff pH -- This is the pH of the last of the runnings from the sparge step. I forgot to take it this time so I left it as 0.0.
End of Running Gravity -- This is the gravity reading of the last runnings of the sparge step. Since I batch sparged, it is the runnings of the wort collected from the sparge step. My reading was 1.033.
2nd Column: Mash Efficiency
Meas Post Mash Gravity -- This is the gravity reading of the wort collected (both initial runnings and sparge mixed together) in the boil kettle. My reading was 1.061
3rd Column: Volume and Gravity in Boiler
Meas Pre-Boil Vol - -This is the volume of wort collected in the boil kettle, including any water or other additions. I got 14.50 liters.
Meas Pre-Boil Gravity -- This is the gravity of the wort at the start of the boil. Since I didn't have any additions of sugars, LME or DME after collecting the wort, it is the same number as the Meas Post Mash Gravity at 1.061.
4th column: into Fermenter
Meas Batch Size -- This is the amount of wort which made it to the fermenter. I ended up transferring 10.6 liters into the fermenter.
Measured OG -- This is the gravity reading of the wort which was in the fermenter. I entered 1.086 which includes both the wort which had been boiled down and a DME addition at the very end.
Next Line - 2nd Column: At Bottling/Kegging
Measured FG -- This would be the final gravity of the beer once it has completed fermentation and I an bottling it. Since this just hit the fermentor, the reading reflects the target value at this time.
Meas Bottling Vol -- As above, this would be the final volume which was bottled (or kegged) and also reflects the target due to the beer currently being in process.
Hope that helps you!
Old Goat