biology coarse adjustment kn diaphragm education eyepiece fine adjustment knob instrument lens medical microscope object holder objective turret ocular lens optic optical research science viewing accessory craft cute elements green holder household object isolated needles Needlework pincushion pins red sewing strawberry stuffed tomato useful candle holder celebration chanukiah golden Hanukkah hanukkiah holy jewish Menorah metal nine relic shamash shiny symbol