In Brazil, the measurement of oil is regulated by ANP and INMETRO. The Technical Regulation for Petroleum and Natural Gas requires that the oil flow meters be calibrated in conditions close to those found at the measurement site, both regarding the fluid (density and viscosity) and operational conditions (flow rate, pressure and temperature). It is very difficult to replicate all these conditions in national calibration facilities and expensive too. Thus, this study evaluated the behavior of 7 Altosonic V meters calibrated with 5 types of fluids (oural, condensat, fuel, heavy fuel and water). The calibration factors of the meters were subjected to statistical evaluation and calibration curves were fitted looking for possible behavior trends. Supposing that flow rates and viscosities would influence randomly the factors, a conclusion was reached that, by using the factory meter calibrations (fingerprint), that cover the entire measurement range of viscosity and flow rates, by using Reynolds number, the required by norm fiscal measurement error limits are met. Thus, it is suggested that periodic checks of Altosonic V could be made with the fluid available in the calibration facility, verifying the consistency of the factors obtained in this calibration and in the fingerprint, aimed at complying with the legal limits of the application.