Electrical Supplies
50Pcs Variable Resistors 3386P 100R 200R 500R 1K 2K 5K 10K 20K 50K 100K 200K 500K 1M Adjustable Precision Potentiometers for PCB Electromechanical components (Size : 20K Ohm)
Potentiometers Temperature Coefficient:+/-250ppm/C Tolerance:+/-10%
https://www.bizrate.co.uk/electricalsupplies/50pcs-variable-resistors-3386p-100r-oid31107032065.html