A new on-farm anaerobic digester (AD) monitoring protocol, recently released by the Association of State Energy Research Technology and Transfer Institutions (ASERTTI) is being used to assess seven anaerobic digesters on dairy farms in New York State. A key component of the ASERTTI protocol is to perform a mass balance of the AD system. Mass balance data is needed to determine system performance values such as: degree of manure stabilization, biogas produced per unit of influent, and subsequent electrical power produced per unit of influent. The optimal location in the system to obtain AD influent mass flow data is at the AD influent pump. However, pumps used to pump manure generally lack performance data, making it difficult to quantify mass flow without knowing the performance characteristics of the influent pump.