How to measure skull height

[sutures]

I have a digital caliper but it's only 15 cm and ofc even an avg skull is longer than this so how can I measure it correctly I tried with measuring tape but I think it's inaccurate . How can I measure correctly

 

[ＩＣＲ]

I have a digital caliper but it's only 15 cm and ofc even an avg skull is longer than this so how can I measure it correctly I tried with measuring tape but I think it's inaccurate . How can I measure correctly

U need a bigger caliper

 

[sutures]

U need a bigger caliper

Isn't there any way to measure with measuring tape or scale

 

[ＩＣＲ]

Isn't there any way to measure with measuring tape or scale

Nah they are probably inaccurate