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GLTL Decade Resistance Box Adjustable Lab Rotary Resistor Substitution Box Precision DC Variable Knob Switch 0-99999.9 Ohms 0.5W: Amazon.com: Industrial & Scientific
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Decade Resistance Box - Ideal Substitution for Standard Resistors - Ranges Over Four Decades - 0 to 11,110 Ohms - Eisco Labs: Amazon.com: Industrial & Scientific
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