The attached prop is exactly one cubic meter calibrated for Poser 7 to PP-2014.

Download it, rename it to remove the .txt extension and import into Poser as an object file.

Then save it to your prop library.

Set Poser units to "centimeter".

Now you can directly measure things in Poser just by scaling the prop along the y, x and z-axis.

As it is 100x100x100 centimeters big, scaling it to 157% along the y-axis makes it 157 centimeters tall.

Scale it to 65% along the x-axis, and it is 65 centimeters wide.

Scale it to match the things you want to be measured and you can directly read the exact dimensions just by looking at the scale dials.

You can also make it transparent or change it's display style to better measure things.

:-)