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Before you install your heater cartridge, you should double check that you got the correct voltage cartridge. They 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.