The IEC Potentiometer (slide wire type) is a classic instrument for teaching electrics. IEC makes both 1m long EM2450-001 and 1/2m long EM2451-001 high quality models. The 1m model has 2m of wire length and the 1/2m model has 1m of wire length. Construction is similar for both models, with aluminium channel base (to avoid the warping and cracking of wood) and a metric rule lies below the 2x lengths of 'Advance' wire (that does not change resistance with temperature). A 'Jockey' is provided for making accurate contact with the wire and the exact position of contact is read on the rule in mm.
Australian made product.
Read the PDF file for more information.

Instruction Sheet