Calibrate, test, and troubleshoot a circuit without having to replace individual resistors. These boxes, also known as resistance decade boxes, can apply different resistances to reduce the current in your circuit. For example, they can help calibrate a temperature-sensing circuit for use with an RTD. Adjust the resistance to match different temperature points on your RTD, then see if your circuit reads the correct temperature.

The switches are additive, so you can create any resistance, in whole ohm increments, up to 11,111,110 ohms.

Boxes with a NIST calibration certificate have passed a test for accuracy.