This is a question answered in two parts:

1) The device has the ability for the end user add a negative offset, meaning to digitally make the starting point of a measurement taken past where the unit is butted up to on the joint of casing to measure.

2) With the thread loss data accumulated via API and thread manufacture’s spec sheets, On Target Measuring has built a large data set of each casing size and thread type.

For an example, in the case of 9-5/8” Buttress casing, the API standard thread loss is .40’. In our measuring device, we would have a digital offset of -.40’.

This would give the end user the ability to place the measuring unit to the end of each joint of casing, and consistently get repeatable measurements, not guessing where the threads ends.

Our standardized procedure for measuring does a few things:

1) A critical step done prior to any laser measuring, is to qualify the device for every job, by hand strapping a joint of each casing type and to digitally measuring to compare. This ensures any user inputted digital offset entered is correct.

2) A line of sight visual of the measuring laser is required to be seen going through pipe and out, prior to target plate user placing the target plate on end of pipe, which accounts for any bowing potential of casing.

3) All strings of casing measured are measured at a minimum, twice and inputted into a comparison spreadsheet, which is archived and maintained internally (which can be audited by customer, at any time) to ensure consistency in our measurements.

Current limitations are capped at 1000 measurements per run, for a grand total of 2000 measurements capable for Run # 1 & Run # 2 combined.