Feedback on 12V water heater element as solar diversion load

My multimeter is probably the cheapest one you could find, I don't remember where I got but probably Harbor Freight or a department store. It read 1.5 ohms for both the old and new 12V 300 watt element.
My clamp multimeter is also a budget model off Amazon. It measured 0.9 ohm on old 12V 300 watt element and 0.6 ohm on new 12V 300 watt element.