To measure circumference, the Ruggedized Handheld Computer (RHC) or other Android-based device must be connected to the caliper head.

Enabling InstaCaliper circumference displays and saves tree measurements in circumference rather than diameter.  For more information about measuring the diameter, see InstaCaliper: Measure a Tree Diameter.

  1. Press the “Config” icon on the bottom of the screen. cog and wrench with word config
  2. Enable "Caliper" by checking the "Disabled" box to the right of the word "Caliper." The box should turn green, show a check mark, and change to "Enabled."
  3. Choose the size caliper head you will be using:  50mm (2"), 100mm (4"), or 150mm (6") by clicking on the circle next to the head size. The chosen circle will turn blue.
  4. Under Measure, choose "Circumference." The chosen circle will turn blue.

If you have any difficulties with this process, please contact 2nd Sight at 509-381-2112 or This email address is being protected from spambots. You need JavaScript enabled to view it..

If you have any questions or need assistance, please contact 2nd Sight at 509-381-2112 or info@2ndsightbio.com