over the years i have had, used and lost too many to count. i liked the GE hp 10, i think it was, ran off 120, had a cord. i currently have 3 tif's, so you know why i am looking to buy a new one for the upcoming year!
last guy i worked for had a d tek, think it was 150 or so from cc dickson when i priced it last year. i was impressed with it, had a fan to circulate the vapor through it, most just sit there and beep
when i worked at UGA, we had refrigerant monitors in all mechanical rooms for the chillers. i have worked on them, and understand how they operate.
what is a good one under 200 bucks? boss is buying 2 for the vans and want 2 good cheap ones
as has been said, good, cheap or fast. you only get 2! i can wait if i have too!!