Y
Yankee Grower
Planty mentioned www.specmeters.com but www.pikeagri.com in Maine also has a full selection.what instrument is needed for sap testing?
You need something like Cardy or Horiba contact meters, not dip, where you drop on about 2 drops of sap. These babies are not cheap and a brix, pH, NO3 (nitrates), K and Na set will run you over a grand.
Here's an OK thread about sap stuff:
https://www.icmag.com/ic/showthread.php?t=159726