Here is a simple technical to measure hole you dug with a post hole digger. Take measuring tape. Place it with the post hole digger from bottom to the end of the post hole digger. Mark each foot division on the post hole digger with a marker. So now you can measure depth of the hole you dug with post hole digger without the need of a measuring tape. If you want to dig 2 feet deep down the earth and you could not find a measuring tape to measure, but markings on the digger will help you to measure the depth of hole you dug.