Originally Posted by TLS
Your RPM's are likely low. If in fact the gun is calibrated for such slow speeds.
That'd be like checking the PSI of a basketball with a 200 PSI truck tire gauge.
Is this on level ground, and on asphalt, not grass.
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We verified the gun with 2 other trucks, and also checked it against another gun.
Flat concrete, zero wind. It is a long private driveway, probably about 2,000 feet long. Completely level. Also PTO was not engaged.
I will post back with more tomorrow.