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
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.
배 율 : 8배율 대물 렌즈 지름 : 20mm 사출 동공 크기 : 2.5mm 실 시 야 각 : 6.6 ˚ 체 감 시 야 각 : 53 ˚ 최근접관측거리 : 4m 렌즈 코팅 타입 : SWAROBRIGHT,SWARODUR, SWAROTOP 코팅 크 기 : 101mm x 59mm x 38mm 무 게 : 215g삼 각 대 장 착 : 쌍안경 거치대 별매 재 질 : 질기고 가벼운 합금, 천연가죽(충격방지,미끄럼방지) 방 수 : 내부 질소가스 충진 (결로 방지, 미터방수[4M]) 구 성 품 : 스트랩, 케이스, 광학섬유 품 질 보 증 : 5년