That's been around. Who's going to buy all of that from Toyota, if they would d even sell it.
The hardest part is getting level. Filling from the upper port with a funnel and tubing and keep at temp.
Measure and refill at room temp is the easiest.

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Measure and refill at room temp is the easiest.

But it's not accurate. The "measure amount drained and refill the same amount" method consistently results in underfilling. If it was accurate then then owners with dipstick equipped transmissions would use it too, but they don't because they know it's not a reliable way of accurately refilling the transmission. A slightly underfilled transmission will cause the transmission to run hotter, transfer less power to the drive wheels and deminish fuel economy.

 

Here’s a 7 minute hand holding tutorial using simple tools for do-it-yourselfers who have never serviced the “no dipstick” 6 speed 2012-2017 Camry/Avalon/ES350 transmission. I substantiated the accuracy of the fluid level checking procedure described in the video by using it to determine the factory original (virgin) fluid level of two near new 2016 and 2017 rental 4 cyl Camrys and one 2016 V6 Avalon. The first 3.25 minutes of the video shows how to check the fluid level in the morning after a cold engine start (outdoor temp around 64 degrees) after the engine has been idled for 4-7 minutes to raise the pan fluid temp to roughly around 104 degrees and then the other 3.54 minutes of the video shows how to drain and refill the oil pan while the fluid temp is still roughly around 104 degrees. https://youtu.be/CAxjhSphZBg

Thanks for the step by step.....I'll try it this summer with my 2017....

 

Here’s a 7 minute hand holding tutorial using simple tools for do-it-yourselfers who have never serviced the “no dipstick” 6 speed 2012-2017 Camry/Avalon/ES350 transmission. I substantiated the accuracy of the fluid level checking procedure described in the video by using it to determine the factory original (virgin) fluid level of two near new 2016 and 2017 rental 4 cyl Camrys and one 2016 V6 Avalon. The first 3.25 minutes of the video shows how to check the fluid level in the morning after a cold engine start (outdoor temp around 64 degrees) after the engine has been idled for 4-7 minutes to raise the pan fluid temp to roughly around 104 degrees and then the other 3.54 minutes of the video shows how to drain and refill the oil pan while the fluid temp is still roughly around 104 degrees.

 

Here is dumb question. Why would I not drain the system at room temp and fill at room temp?

 

Not dumb at all. I've done it like that the last few times to my transmissions with or without a dipstick. It gets the level real close, or right on the money.
The first time I tried it on my 2017 Camry with no dipstick, I checked it once again using the drain tube at operating temp and the level was good. My brother in law who is a toyota tech says they often slightly overfill the transmissions to help them shift better when cold.

 

What's so critical about the temperature being at 104 or 106F ? Does the volume of fluid change significantly with temperature?

How critical is the absolute level of the fluid, is there a +/- tolerance of fractional ounces by volume?

Is it possible to do a less-messy method:
Park in a somewhat level place to do the work, then open the drain plug and catch any that comes out and measure this into a separate container;
then remove the plastic overflow tube to drain out the rest and measure this into another container.
Now you know the volume held below the overflow tube (equal to the nominal level in an operating car), and the amount above that level when cold (equal to the active volume in the operating system that drains back to the pan).
Refill using an amount equal to the sum of these two volumes, this will put it back to the same level as it was.
This assumes there were no leaks and that the OEM fill at the factory was correct,

If you want to do a level check then start the car and shift thru the gears a few times to warm up the fluid, then open the drain plug and measure what comes out; this would be the amount overfilled. If none came out then add some until it dribbles out and put the plug back in. If you want to run a little higher level, then add a few ounces after the plug is back in so it doesn't dribble.

i can't believe that much precision is required when using a procedure to just add fluid until it dribbles out the overflow tube, but i'm happy to be proven wrong if all this is critical...

[edit] Well maybe i am wrong, according to OEM method that requires a vacuum pump, fluid pump and custom overflow tube as explained by Dr. Kelly

 

I think that most of us who undertake the job of replacing their WS fluid may have bought their Toyota used, in which case we are wanting to firstly verify correct fluid level if it's the first time messing with the WS fluid.

The temperature range for checking the fluid level is fairly broad, even as the fluid temperature rises through that range in just minutes while the engine is running.

I would say that, except when your hands were cold, we could judge the pan temperature by hand, 113F being very warm and 95F being just warm (at slightly below body temperature).
Making sure that the cylinder hear temperature is below 90F before re-starting the engine (after over-filling the transmission) is important though, since the engine coolant inter-cools with the transmission fluid. Using a fan to cool a warm engine really speeds things up!

It's kind of a bummer that the threaded metel bung in the pan holds back nearly a full quart of fluid even with the plastic "straw" removed. I used a thin, curved piece of silicone tubing to pull out that last quart of old fluid before refilling (over-filling actually) the pan, this before starting the engine for my subsequent "flush" out of the cooler line.

The only good thing about this whole procedure is that it's gonna seem a lot simpler your second time around, especially for me having to level my car on a sloping driveway!

For those doing one or more "flushes" or just a spill-and fill job, be sure to over-fill the transmission by at least one quart so as to increase the amount of fluid being replaced without incurring much added labor. That will mean more old fluid coming out when the plug is pulled for the level-check, so leave a little extra time (start at the lower end of the temperature range when pulling the plug). And buy fluid by the gallon, it's cheaper that way so you can chase out more of the old fluid!

Measuring the volumes of fluid coming out and going back in is complicated by the amount of fluid that sticks to the pan and measuring container, so both containers should be pre-wetted with fluid before draining the fluid and before pouring the drained fluid into your measuring container (this should help prevent loss of fluid volume between what comes out and what goes back in).