The number of Accuracy Checks and/or Calibration Adjustments available from a 108 liter alcohol gas tank depends on the regulator that is used and the amount of gas that is used with each test (how long the regulator button is depressed).
The 1.5 lpm (liter per minute) regulator will yield approximately 300 tests from a 108 liter tank if using approximately 8 seconds of gas per test.
The 6.0 lpm regulator will yield approximately 150 tests from a 108 liter tank if using approximately 8 seconds of gas per test.