Measuring in Maths

We are having a great time learning about different measures in Year 4 in preparation for making our WWII Anderson Shelters.

Today we looked at estimation and identified different objects that we thought measured either 30cm or 1m. 
Have a look at our suggestions. 

Can you estimate the measurement on any household objects?  How accurate were you to the nearest mm?

Where else do you see measurements of length used?