What is browser height?
The 'Browser height - bucketed' dimension shows the height of the browser window, classified in groups of 100 pixels. This dimension is useful when you want to understand where the “fold” is on your site to visitors. Understanding where your fold is can allow you to optimize content for viewing.
How do I know my browser pixel size?
In Chrome, right-click (or control + click) in the content area and choose "Inspect Element" to open the element inspector. In the new window that appears in the bottom of your browser, move your mouse within the code until you see the content area highlighted (usually in blue).