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fresh and positive Features: This collimator helps 7 levels of brightness adjustment of laser. Can assist correct collimation of telescope in a quick and simple way. With an adapter, transferring 1 to 2inch thread. Power saving design, low consumption and sturdy for very long time use. Suitable for Newtonian, Marca. Specification: Powered by: 1 x CR2032 Lithium battery (not included) Adapter type: 1 or 2inch Laser Power: 1mw 5mw Laser Brightness Adjustment: 7 phases Shell material: Metal Dimensions: 48x146mm/1 Color: Black Quantity: 1 Set Note: 1 allow 0-3mm error because of handbook measurement. pls ensure you do not intellect before you bid. 2 to the variation between various monitors, the image might not mirror the particular color of the item. Thank you! Package includes: 1x Laser Collimator 1x 2” Adapter Sleeve 1x User instruction manual '