Which reading represents the lowest vacuum reading?

[Pineappleeh]

Question 1

Which part MUST be used when refitting a vehicle from R-12 to R-134a refrigerant?
◦ A new condenser
◦ A new service fitting and a retrofit label
◦ A high pressure cutoff switch
◦ Both B and C

Question 2

Which reading represents the lowest vacuum reading?
◦ 27 in. Hg
◦ 28 in. Hg
◦ 29 in. Hg
◦ 500 microns

[kalskdjl1212]

Answer 1

Both B and C

Answer 2

500 microns

[Pineappleeh]

TYSM

[mcabuhat]

Thanks for the timely response, appreciate it