TOF Calibration Low Mass Training Kit A is to be used when training on the calibration of a ToF in the low mass range. Kit contains 30 mL of 2 ng/uL leucine enkephalin in 50/50 acetonitrile/water, 2 mg of leucine enkephalin in a 4 mL amber glass vial, 18 mL blank solution of 50/50 acetonitrile/water, 10 mL of 0.1 M sodium hydroxide in water, and 10 mL of 10% formic acid in water.