How important is DC Resistance?
DC resistance (kΩ) is a handy but rough measure. The DC resistance of any given pickup will change based on other variables like temperature. For example if the pickup has been sitting in a sunny window and is warmer, the dc resistance will read higher. If you took that same pickup and stored it in your basement / practice room and it was cooler in temp, the dc resistance would read lower. The dc resistance will also read lower once the pickup has been installed into your guitar. Another factor is variation of copper wire. Although it’s manufactured to rigorous specs, variation exists between spools of copper wire—including spools made by the same manufacturer and from the same lot number. A microscopic size variance that’s still within specs can affect dc resistance. Equipment calibration can vary between ohm meters and can also change if your battery is low.
