Look through the light bulbs with a pair of salit bin spacing 50 micrometre salit and provide close to salit bin in parallel with the filling tube. Observe and record images
Look at the filling ผ่านสลิ couple with the distance between the lamp unit channel 50 micrometers. By ให้สลิ unit near the eyes and channel slits parallel to the filling tube. Observe and record the image to see.