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 : 30mm 사출 동공 크기 : 3.8mm 실 시 야 각 : 7.8 ˚ 체감 시야각 : 62.4 ˚ 최근접관측거리 : 4m 크 기 : 141x110x64mm 무 게 : 590g 렌즈 코팅 타입 : SWAROBRIGHT SWAROCREAN 코팅 재 질 : 고강도 알루미늄 마그네슘 하우징 방 수 : 내부 질소가스 충진 (결로 방지, 미터방수[4M]) 구 성 품 : SLC 8x30 WB 대물렌즈 커버 접안렌즈 커버 스트랩 케이스 스냅샷 아답터 광학섬유 품 질 보 증 : 5년
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