The Zip Level Pro digital altimeter is a very simple tool mostly used for those who would go out to estimate a job, but can also be used in the field. Firstly, choose a centralized area, then pull out the measurement module and enough cord for the working area. Then zero out the altimeter at your “zero point” – any other point you set the measurement module to will give you a digital readout of the exact elevation difference from the “Zero Point”.