A nozzle gallery allows for calibration of measuring devices for volume or mass flow with a wide measuring range with only one, compact flow adjustment system. The galleries can be automated completely by pneumatically pre-controlled valves. They consist of inlet block, nozzle section with middle block and outlet block. There are 4 connections for sensors (2 x pressure, temperature and relative humidity) and up to 9 connections for nozzle adapters, where the connection on the (other) side of the inlet collecting block takes up the nozzle with max. throat diameter, if required. Each nozzle adapter can be equipped with a critical nozzle.