Harbor Freight A/C Gauges

[afroengineer]

Anybody have any experience with Harbor Freight A/C Gauges?
Are they worth $30 and are they accurate and useful enough to refill my system with refill canisters from auto zone or o'reilly?

 

[chpmnsws6]

I've used them for the last 6-7 years with great success. Even if they are a few pounds off, your going for duct temps and clutch cycles more then anything.