The simplest solution is to buy a flashlight bulb, e.g., 6V/2.4W (or something similar) and use that for a load. It has the added advantage that you can actually see that the load is working. The suggested bulb will work fine for 4.8 - 6 V Rx packs.

There is absolutely no need to buy 1% resistors unless you plan to operate several loaded volt meters and want to compare measurements between them.