I spun it cold, with no oil. I'll try it again lubricated. I tried it on my nt15 engine which is brand new, never tested and it showed 35psi.

Those are both pull starts, you're supposed to give it 6 or 7 pulls and it records the psi. If you have a starter box, you're supposed to crank it for 4-5 seconds.

for $35, I thought it was a useful little device.