Kern egg grader
This egg sorting scale was made by the firm Gottlieb Kern & Sohn from Albstadt in Germany. The scale has the egg classes 1 through 7 above the scale in grams. This grams scale goes from 40 to 75. The egg sorting scale was presented for the first time in the Kern catalog of 1978 as model 552. The last entry is in the Kern catalog of 2005. On the egg graders as from 1996 the egg classes were changed to S (<53 grams), M (between 53 grams and 63 grams), L (between 63 grams and 73 grams) and XL (more than 73 grams). After 2005 the model was still sold by the firm Schumann from Sillerup in Germany. Now Wöhrmann Elektrotechnik und Maschinenbau GmbH sells the last items that are still in stock. The Kern egg scale is the successor to the Hartner egg scale, see here. At Kern the scale housing and egg holder became plastic instead of aluminum. In the tube under the egg holder holds the lead balls of calibration, an aluminum screw cap closes the tube. A red rotary knob is at the bottom of the scale. During normal scale use this knob is rotated outwards to its max. To protect the weighing mechanism during transport the red knob is turned inwards as much as possible, this locks the movement of the mechanism. It is thereby absolutely essential that the egg holder is pressed down in such a way that the pointer is between 55 and 60 grams. After this, the egg holder must be removed from the aluminum tube. The Kern Eiersortierwaage (German for egg sorting scale) has just like the Hartner and the Fabian a magnetic damping and its own 50 grams check weight.
Below some more images of the Kern 552 egg grading scale.
back of the scale
