Amazon.com: NEWTRY ZX21A Variable Decade Rotary Resistor Box Precision DC Adjustable Resistance Box Knob Switch for lab 0.1R to 111.1110KR (ZX21A) : Toys & Games
NEWTRY Variable Resistor Box Standard DC/AC Rotary Resistor, Adjustable Rotary Knob Switch for Laboratory, Schools, Factory and Research Institutes, 6 Groups 0-11110R Ohm (0.25W) : Amazon.de: Business, Industry & Science
10 Watt Per Resistor Brass Resistance Box, 0 To 120k Ohm