Equipment for what? Measuring resistance? The Arduino can't. It measures voltages.
Sending the data? How much data? How often? How far? In what kind of environment? With what acceptable failure rate? Do you need bi-directional communication? What is your budget?
Equipment for building the setup for measuring the resistance of the resistor - I bring the resistor. Regarding Arduino's meas., I found some papers regarding using another resistor and subtracting the voltages to calculate the resistance of my resistor.
Sending data from the resistor site to the arduino - I need 6.5 digits ,every 0.1seconds at least. ambient env., not familiar with failure rate. One direction communication. Budget is less problem BUT the transmitter package should be as small as it can.
Thanks.