Part of the Platon GMT Variable Area flowmeter family,models GMTB and GMTS are brass or Stainless Steel tube flowmeters with female screwed connections. With 1/2", 1" and 2" BSP/NPT threaded fittings standard, the meters are ideal for arduous industrial service as an alternative to large glass tube flowmeters. They have particular advantages for gas or liquid flow measurement at high pressures and temperatures, where the fluids are opaque or dark coloured or to provide higher operational security for dangerous or toxic materials.