Cher,
Your shopping list seems pretty complete. You said a parts per million tester as part of your list, did you mean a Total Dissolved Solids (TDS) meter? If so, that would be optional as it is only used to make sure that your distilled water that you start with is zero or very close to it. The TDS meter can not measure the PPM of the colloidal silver....at least not accurately and with the Elite, you already know what your PPM will be since you use the soft touch screen to adjust the PPM and batch size to whatever you want. A distiller is only needed if you plan to make your own distilled water and that would likely depend on where you are. In the states, a gallon of distilled water can be had for less than a dollar, but other parts of the world may be significantly more, making a distiller more practical. Also, if you plan to make mostly 320 ppm colloidal silver, you will use only minimal amounts of distilled water compared to 20 ppm colloidal silver. The magnetic stirrer/hot plate is a must for making high PPM silver nanoparticles and or running at high milliamp settings.
For myself, I opted for a basic beaker set from Amazon. I think it was between $20 and $30 if I remember correctly. I like it because the openings make it easier to clean than a mason jar. I use the one liter and 500 ml beaker to make 20 ppm Colloidal Silver and I use the 250 ml beaker to make 320 ppm Colloidal Silver which is what I use the most. The borosilate glass can also take more extreme temperature changes than the mason jars without cracking. I did crack one mason jar when I poured Colloidal Silver in it that was too hot. I did buy various size mason jars, but I use them for storage only.
Yes, the V.3 Elite comes with an electrode holder that is predilled for proper electrode spacing and doubles as a lid .
One thing I always recommend is to upgrade to a one ounce silver bar over a silver wire or rod. The bar, because of its relatively large surface area is more efficient than the wires and in conjunction with your hot plate/magnetic stirrer will allow you to run your batches as high as 15 ma which will equate to shorter run times and a very good quality finished product. The silver bar also lasts a very long time compared to the wires.
I did not see Arm and Hammer Washing Soda on your list. You will need a box of that to make your electrolyte solution and a bottle of Karo light syrup to make your reducer. Lastly, if you plan to make high parts per million Colloidal Silver such as 320 ppm, you will also need Knox Gelatin in the small packets to use as a capping agent.
If you have other questions, just post them and they will get answered.
Art