TY - RPRT TI - The design and performance of a second-generation phi meter AU - Falkenstein-Smith, Ryan AU - Cleary, Thomas PY - 2022 PB - National Institute of Standards and Technology (U.S.) CY - Gaithersburg, MD SN - NIST TN 2184 DO - 10.6028/NIST.TN.2184 ER -