To check a level for accuracy (quick way). Place against the door jamb of your house. Notice where the bubble is. Flip it over. The bubble should be in same place. Do this on the vertical and horizontal jambs.
Am I the only one living in central Arizona that is looking forward to the nicer weather to camp? I am super excited to get out as the temperatures plunge into the 30s 40s and 50s . Where are your favorite spots to go when it gets out of the hundred degree range?
The rule of thumb talk to me by my father and grandfather before him was to grab a finger full of grease and rub it between your fingers. You will know if there is any grit. Color means nothing as long as the grease is slick between your fingers. If you feel any kind of resistance or grit repack.