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.
20-60×80 폴라스코프 배율(Magnification) 20~60x zoom 구경(Objective lens , mm) 80 화각 2 ° at 20X 1 ° at 10X 1000M에서의 시계(Field of view at 1000M , m) 105ft at 20X 52ft at 60X 사출동공 4-1.33mm 길이 437.0mm 무게(Weight , kg) 1.2kg