Can anyone tell me how to find the value of this machine?

Here are the specs:

onan engine - DC-225/3-AS
equiped on two wheel cart

output range: 40-225 amps DC welding current
input: 1 phase/  50/60 mhz

3000 watts continuous power / 115v or 230v AC auxiliary power
Air cooled, engine driven, gas powered

Thanks!!!!

Russ Snowburg