Electrodes with Fixed or Adjustable Plates are primarily utilised for assessing conductivity levels in liquids. Certain models feature lamps that are connected in series with the plates, while others utilize fixed stainless steel rods for measurement purposes. Adjustable: Simplifies measurements and speeds up experiments. Can be placed directly over a beaker and have a 75mm length. They are insulated except for a 10mm x 10mm area at the tips and can be adjusted for variable separation. Read Instruction Sheet Fixed: Come with an MES threaded lamp socket that can fit a standard small torch globe, visibly indicating the flow of current between electrodes. The globe's rating may vary based on the electrolyte's conductivity and the type of experiment being performed. Read Instruction Sheet Weight: 0.10 kg Product Code Item Type Dimensions (lwh / mm) Descriptions SE.EM1790-001 Adjustable 120 x 40 x 85 SE.EM1791-001 Fixed Plate / 4mm Terminals 100 x 25 x 90 has 2 s/s plates, 50mm wide x 75mm long, fixed at a separation of 5mm SE.EM1792-001 Fixed Rod / 4mm Terminals 100 x 25 x 90 has 2 s/s rods, 2mm dia. x 60mm long, fixed at a separation of 1.5mm SE.EM1792-101 Fixed Rod / Cables & Alligator Clips 100 x 25 x 90 has 2 s/s rods, 2mm dia. x 60mm long, fixed at a separation of 1.5mm