Not bad cartridges for the heater. The outer diameter is 5.75 ± 0.02 mm. I measured the resistance of all 5 as follows: 1. 13.0 ohms2. 13.2 ohms3. 13.6 ohms4. 13.4 ohms5. 14.6 ohms 13.6 ohms average with a standard deviation of 0.6 ohms. At 24V they draw about 1.8A, which is an average of 42.5 watts. I tested one and measured 1.87A at 24V. #5 is slightly different than 39W but still within reasonable limits. The insulator has a wax coating that is sticky to the touch. I really don't like that aspect, but other than that these cartridges work well.
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