measure techniques

[Halfathumb]

How do you measure a large inside dimension like on a cabinet checking for square?

Using a standard measuring tape isn't exact. Do you use a helper when the distance is exceeds your reach? Has anyone come up an adjustable jig of some sort? 

Jim

[Ray Newman]

Make some bar gauges or "pinch sticks" --

https://www.leevalley.com/en-us/shop/too...em=05N3101

https://www.youtube.com/watch?v=1y3fiwTrtW8

https://blog.lostartpress.com/2013/04/03...materials/

https://thewoodwhisperer.com/articles/measuring-sticks/

Depending upon carcass size or design, this also might work: 

https://www.leevalley.com/en-us/shop/too...em=50K5801

[Admiral]

I have the Veritas heads and have used them for over a decade or more, that's what you need. Highly recommended.

[Ray Newman]

Admiral is onto it! I bought the Veritas bar gauge heads on a whim about 20 yeras ago when I got tired of always clamping on a binder clip and the clip always seemed to slip.

[Willyou]

All great suggestions above. I usually just grab some scrap sticks and square off the ends as in the video Ray posted. If the two sticks are to long to easily hold together, I put a small clamp on them. This is probably the most accurate way to do an inside measurement.

[JGrout]

Tape measure for all cross measuring perfectly adequate for me to 1/32"

[Alan S]

A pair of brass stair gauges designed to clamp to a square to mark an angle work well to clamp together a pair of rules for use in the same way as the Lee Valley tool.

  If you have an old fashioned folding rule with a 6" sliding extension, that's my favorite for internal measurement.

[Halfathumb]

A pair of brass stair gauges designed to clamp to a square to mark an angle work well to clamp together a pair of rules for use in the same way as the Lee Valley tool.

  

Great idea. Now I have to find them


Jim