
Dissolved oxygen meter made by J. Bibby Scientific Products Ltd
Dissolved oxygen meter made by J. Bibby Scientific Products Ltd, Stone, Staffordshire, model SM01, in blue carrying case 350mmx250mmx10mm, with instruction book, c. 1986
Dissolved oxygen meter made by J. Bibby Scientific Products Ltd, Stone, Staffordshire, model SM01, in blue carrying case 350mmx250mmx10mm, with instruction book, c. 1986