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.
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Specifications Fieldmicroscope Magnification (x) 20x (fixed) Optical system Upright, unreversed image; eyepiece diopter adjustable for right eye; 56-to-72mm interpupillary distance adjustment Field of vision (mm) 11 (diameter) Angle of view (º) 12.6 Vertical adjustment 50mm from the base of stage Eye relief (mm) 11.1 Plate Removal and reversible (top: flat; underside: built-in cup) Light source 2.5V-0.5A halogen lamp Light settings On/off Power source CR 123A lithium battery; approx. 1-hour bat
재질 : 원목 사이즈 : 가로27cm X 세로18cm 구성 : 16종 나무 조각들로 구성되어 있습니다.
배 율 : 10배율 대물 렌즈 지름 : 25mm 사출 동공 크기 : 2.5mm 실 시 야 각 : 5.4 ˚ 체 감 시 야 각 : 54 ˚ 최근접관측거리 : 5m 렌즈 코팅 타입 : 풀리멀티코팅(전체풀코팅) 삼 각 대 장 착 : 쌍안경 거치대 별매 크 기 : 109 x 121mm (펼쳤을 경우) 72 x 121mm (접었을 경우) 무 게 : 295g 재 질 : 가벼볍고 튼튼한 합금, Rubber(충격방지,미끄럼방지) 방 수 : 생활방수 구 성 품 : 스트랩, 케이스, 렌즈 커버 품 질 보 증 : 2년 10x25 Naturescape, Roof, Fully Multi-Coated, Compact, Twist up eyepieces, Carrying puch, cleaning cloth, and neckstrap included, Designed for extreme portability and rugged performance, Limited lifetime warranty. Desi