These two tuners are basically the same functionality wise, and the major difference is in the meter, with the 941E having a dual needle / cross needle Forward/Reflected power meter where you read the SWR at the intersection of the needles. [It also has a 2.5mm 12 volt DC in jack to power the meter light, while the 941D does not have an illuminated meter.] The 941E meter is larger, the background (on my unit) was much more white and easy to read, even without a light, and it of course completely outperforms the non-lighted 941D at night. It is also much easier to use, as the only user interface is "light on/off" and "power 30/300". The 941D meter requires that you select Power / forward or reverse, or SWR, and you have to calibrate it before using it to display the SWR. [On the other hand, I personally prefer having the SWR displayed directly on a meter, instead of having to infer it form the intersection point of two other needles.] Eventually I went with the 941E mostly due to the larger illuminated meter. In both cases, you can buy a $30 meter from china that has more accuracy at the lower end of the scale. I've found that the MFJ meters don't read much below 1 watt (forward or reflected) so I have to tune my antenna at low power, and then switch up to higher power to dial in the tuning to get the lowest SWR, because my reverse power is lower than 1 watt when my radio is at it's lowest 10 watt output setiting. The more I use my $30 Chinese Surecom SW-112HF, the better I like it, so I do recommend that if you are looking for a stand alone VSWR meter. https://youtu.be/IKdMe0cLGLM

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