Welcome toArabianSea(Marine Electronics and Instruments)Product Name:KTLASS GLH-130-60 Marine Sextant. Made in China. Free Shipping. Product Brand:Product Condition :Model No:Product Condition :Tested ok. Check Pictures. Product Inclusion :What you see is what you get unless otherwise specified. Description/Features/Specifications :SpecificationsPlace of Origin:Jiangsu, China (Mainland)Brand Name:TRUSTModel Number:GLH130-20Marine Equipment Nautical Sextant:GLH130-20/40/60 Marine Equipment Nautical SextantType:Navigation ToolPart:marine sextantMaterial:copperMeasurement Range:-5 to 130 degreeMinimum reading:20 degreeTemperature Range:-30 to 50 degreeTelescope:3.5X20''Lamp voltage:3VMarine Nautical sextant is a kind of reflection type angular measuring optical instrument, chiefly used for measuring the altitude of celestial bodies to obtain a position in navigation. The VERTICAL ERROR, ERROR and INDEX ERROR of the instrument should be adjusted and predeter mined before use.Application:1.Measuring the altitude of celestial bodies to determine the position of the shipatsea.2.Measuring the two horizontal angles between three known position land objects the ship. 3.location on chart by the help of a station pointer.4.Measuring the vertical angle of a known altitude objection to obtain its distance.==================================Terms of Sale We ship using DHL, Fedex or India-Post.Payment using Paypal.