guys, just use ohms law to calculate the expected resistance:
Resistance = Voltage * Voltage / Power
12v 30w cartridge :
R = 12 * 12 / 30 = 4.8Ohm
if you measure 7.1 ohm, actual wattage is:
P = 12 * 12 / 7.1 = 20 watt, the heating element is likely damaged and shall be replaced. (your meter will likely be out of cal for +/- a few percent, but measuring 7ohm from 5ohm is more than 40% out, that’s unlikely, check the lead resistance, or better yet, apply 12VDC t, and measure current directly.
For 12v 65w cartridge:
R = 12 * 12 / 65 = 2.22ohm
For 24v 65w cartridge:
R = 24 * 24 / 65 = 8.86ohm
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