Coffee Reference is 1.40% +/- 0.02%; 1.25oz (35gr)

Espresso Reference is 9.70 +/- 0.03%; 1.25oz (35gr)

Specifications are for use at 20.0 +/- 2.0 Deg C

Recommended use: 

Accuracy is warranted for 30-days after opening. Accuracy can be maintained for up to 90-days, if kept tightly capped immediately after each use.