PRESSURE TESTER by METRON
Metron Model 350 Gauge Tester:
This self contained unit has its’ own high pressure rechargeable bottle inside
The center gauge is the supply gauge and reads to 3,000 PSI
The other two gauges are test gauges for checking your field gauges or switches
1. Metron 350 Gauge Pressure Tester
A. 0-100 Ashcroft Test Gauge with mirrored scale
B. 0-2,000 Ashcroft Test Gauge with mirrored scale
C. Gauge accuracy is 3A (0.25%) for both test gauges
D. Zero Halliburton Aluminum Tester Case
NOTE: I do not have a high pressure gas cylinder to test this unit
PS: Did I mention it was made in the Good Ol' USA!       

SOLD AS IS, I don't know how this works or if does. - weighs 24 pounds