Compare two value

Hi,

I'm a beginner with PowerBi...

I have two table linked by "item" value.

On the first table i have an unique item value on the first column and "standard item value" on the second column.

On the second table i have an item list with associed "measured value"

I want to compare "measured value" with "standard item value"?
How can i do it?

Table 1 (Item Nr, Standard Item Value)
1, 50
2, 55
3, 125

Table 2 (Item Nr, Measured Item Value)
1, 55
1, 60
1, 50
2, 53
2, 55
2, 60
2, 60
2, 50
3, 1000
3, 100
3, 125

Thanks in advance for your help...