I'm not qualified to properly answer your questions but I won't leave them unanswered:
1) Yes, load capacity can be tuned for during the tuning process. What variables need to be adjusted for in terms of refrigerant psi levels and actual form function of the lines is a mystery to me.
2)Drnip, Punx, Buckeye, and prolly a few others can chime in for recommended DMM's. I picked up a black n decker from Sears but noticed the included temp probe doesn't read below 0c very well. So I'd suggest surfin thru the XS dude's screenshots for a proper brand. K-type probes are used for the sub-zero stuff.
3) The amount of Refrigerant plays a role in the capacity and depth of temperatures of the phase rig, a smarter more knowledgable refrigeration expert could explain this.
4) The Leet guys actually mix some refrigerants together to obtain a certain performance. The ratio's are closely guarded secrets.
5)Lotsa people still selling and using the chilly1 head.
6) Completed single stagers are apearing for around 400 bucks thru 1200 bucks (be careful of the Magna_Farce brand)
There should be a refrigeration basics link in the phase section also, FYI.
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