Digital turbine flow meter, digital type oval gear flow meter and Coriolis flow meter can be digital hydraulic oil flow meter.
It not only shows the hydraulic oil totalized flow ,also instant flow through the electronic display.
Besides that it can have 4-20mA output, pulse output, RS485 or Hart Protocol function.
Digital hydraulic oil flow meter can be volumetric flow meter or mass flow meter.
It can be thread or flange or wafer process connections.