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Before you install your heater cartridge, you should double check that you both purchased and received the correct voltage cartridge. Cartridges are laser etched with their voltage, but all it is worth double-checking anyway. This process is less annoying than putting out a house fire.

If you have a 12v30w heater cartridge, your multimeter should read 4.8Ω

If you have a 24v30w heater cartridge, your multimeter should read 19.2Ω

Your cartridges resistance may deviate slightly from these numbers, which is fine. We're mostly interested in verifying which cartridge type you have.

If you have a 12v 40w heater cartridge your multimeter should read 3.6Ω

If you have a 24v 40w heater cartridge your multimeter should read 14.4Ω