Sampling scissors and method for using the same

A pair of sampling scissors comprising a tray, a blade, a first hand grip, a second hand grip, a first guide rail, a first slider and a first position fixing device;

• wherein the tray is connected with the first hand grip and the blade is connected with the second hand grip, and the first hand grip is pivotably connected with the second hand grip through a central shaft;
• wherein the blade comprises a first cutting edge disposed at edges of the blade, a projection of the first cutting edge onto a bottom surface of the tray is a hollow and closed pattern, the first cutting edge is perpendicular to the bottom surface of the tray for shearing off a sample, and the tray is configured to receive the sample;
• wherein the first slider is disposed on the first guide rail, which is fixed to the second hand grip, and is fixed to the blade, and the blade is slidable along the length of the first guide rail through the first slider;
• wherein the first position fixing device is constructed to fix the first slider to one of a plurality of positions on the first guide rail, and comprises a clip which is movable along the length of the first guide rail;
• and
• wherein a first groove, extending along the length of the first guide rail, is disposed in the first guide rail, the first groove comprises a first opening extending along the length of the first guide rail and close to the first slider, a width of the first opening is smaller than a width of the first groove, the first slider has an integral structure that comprises a first slider main body, a travelling element and a first neck portion which is between the first slider main body and the travelling element, and a width of the travelling element is smaller than or equal to that of the first groove but larger than that of the first opening, the travelling element is in the first groove, the first slider main body is out of the first groove and the first neck portion is at the first opening, a width of the first slider main body is larger than that of the first groove, and the blade is fixed on a surface of the first slider main body facing away from the first opening.