Easy blowing, High tone dog whistle, fitted with solid, waterproof pearl, to give a trill for those who want a distinctive and different sound. With a frequency that fluctuates by 750 Hertz. 210 Small ultra high pitch whistle has a natural cork ball which produces the familiar 'trilling' roll of the pea whistle. 210.5 Same as the 210 but with out the cork ball, produces a single extremely high frequency.
수생식물 36가지를 선별하여 제작한 포스터입니다. 수변식물부터 부유, 부엽, 수중식물까지 대표적인 수생식물들을 모았습니다. 1. 크기 : 가로53.5cm X 세로77.5cm 2. Illustrator : 이해직, 김재환 3. 수록된 식물 : 동의나물, 비비추, 부처꽃, 갯버들, 물솜방망이, 앵초, 숫잔대, 미나리, 꿩고비, 꽃창포, 속새, 줄, 갈대, 질경이택사, 창포, 부들, 세모고랭이, 흑삼릉, 줄무늬창포, 매자기, 가시연꽃, 연, 수련, 순채, 왜개연꽃, 어리연꽃, 마름, 개구리밥, 노랑어리연꽃, 통발, 물수세미, 자라풀, 가래, 물옥잠, 물부추
Specifications Fieldmicroscope Mini Magnification (x) 20x (fixed) Optical system Upright, unreversed image; eyepiece diopter adjustable for right eye; 51-to-52mm interpupillary distance adjustment Field of vision (mm) 11 (diameter) Angle of view (º) 12.8 Vertical adjustment 42mm from the base of stage Eye relief (mm) 12.8 Plate Removal and reversible (top: flat; underside: built-in cup) Dimensions (mm) (In use) 156-202 (H)x89 (D)x90 (W) (Folded close) 124(H) Weight (g) Approx. 395 Accessories S