Davis Instruments Mark 15 Sextant,六分儀

Davis Instruments 026 溫濕度計

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馬克3六分儀 

有時也被稱為“救生艇”六分儀，馬克3是一種廉價的培訓六分儀。然而，這種模式已在世界各地的水手。它是全尺寸的，具有遮陽，但沒有光學放大倍數，以幫助您找到昏暗的天體。

馬克15六分儀 

這種模式有很多強大的功能，包括7大遮陽傘，3毫米X 27毫米口徑的星范圍，且易于閱讀的測微鼓的游標刻度讀取到一分鐘的2月10日。馬克15具有7“（18 cm）畫框半徑畢業于120度到-5度，并配有傳統的半鍍銀鏡。

馬克25六分儀 

該行戴維斯塑料六分儀的頂部，馬克25我們的特色束會聚器?鏡，有時也被稱為“全視界鏡子”。一個特殊的涂層被施加到高品質的光學玻璃，以允許用戶看到通過該反射鏡，但仍然拾取圖像作為微弱的低光分。標記25是由一個長壽命的LED，并提出一個升級的塑料，這是非常穩定的照明。

Mark 3 Sextant
Sometimes referred to as a "lifeboat" sextant, the Mark 3 is an inexpensive training sextant. Yet this model has taken sailors around the world. It is full-sized and has sunshades, but no optical magnification to help you find dim celestial bodies.

Mark 15 Sextant
This model has many great features including seven large sunshades, a 3 mm x 27 mm star scope, and easy-to-read micrometer drum vernier scale that reads to 2/10 of a minute. The Mark 15 has a 7" (18 cm) frame radius graduated from 120 degrees to -5 degrees and comes with a traditional half-silvered mirror.

Mark 25 Sextant
The top of the line Davis plastic sextant, the Mark 25 features our Beam Converger^? mirror, sometimes referred to as a "full horizon mirror". A special coating is applied to high quality optical glass to allow the user to see through this mirror, yet still pick up images as faint as low-light stars. The Mark 25 is illuminated by a long-life LED and made of an upgraded plastic that is very stable.