Includes three color calibrated reference cards. | It helps you get correct white balance, or color balance, allowing the camera to compensate for the illuminant color in a scene. | For optimum color correction: the black card achieves truly deep blacks (RGB 16,16,15); the grey card displays superior spectral neutrality with measured values of 162, 162, 160; the white card has a tested RGB value of (220, 224, 223). | The neck strap with quick-release plastic buckle on the end, convenient for your use.

Compatible with :Nikon D80 D90 D300 D300S D600 D800 D3100D3200 D3200 D5000 D51000 D5200 D7000 D7100 etc camera and Nikon SLR and Nikkor AF, AF-S, D, G and VR lens series Cameras | It moves the lens farther from the film or digital sensor. The farther away the lens is, the closer the focus, the greater the magnification | Configuration:Engineering plastics material + metal bayonet,seven kinds of combinations, seven kinds of magnifications,Perfect for macro shooting | Meike MK-N-AF1-A Tube diameter : ab.62mm. Tube Lengths: (1) 12mm.(2) 20mm.(3)36mm | Macro extension tube can be used alone or in superimposed，When using the extension tubes alone (10mm or 20mm or 36mm ) or combination (10mm+20+36mm=66mm),support AF(Auto-Focus), AF Motor Protection: while using 3 rings together, we suggest you to use manual focus or Increase the lens focal lengths for it's a little bit difficult to auto-focus with 3 rings together, and also protecting your lens motor

COMPATIBLE AND ABOUT THE SIZE - Fit Toshiba Canvio Basics / Toshiba Canvio Advance / Toshiba Canvio Flex / Toshiba Canvio Gaming / Toshiba Canvio Slim / Toshiba Canvio Connect II / Seagate One Touch / Seagate Backup Plus Slim / Seagate External / WD My Passport / WD Elements, 500G 1TB 2TB 3TB 4TB 5TB and more. Size: Exterior: 6.22" x 4.48" x 1.88" & Interior: 5.35" x 3.50" x 1.18". | WATER RESISTANT & MOISTURE PROOFING - Made of waterproof PU Material, which obstructs water and vapor effectively. Don't worry about getting your hard drive and accessories wet from splashing water or rain. You can just place the case right by your side when having coffee, tea or juice. And securely carry the case with you even if you come across a rainy day. | SHOCKPROOF BUBBLE LINING - Extra soft, The anti-static, shock absorbing, the product can effectively absorb impacts. Reduce damages caused by accidentally bumping, protects your hard drive from bumps, scratches, and dents. | TRIPLE LAYER DESIGN STRING BAG STORAGE & BUILT-IN HOLDING BELT - Enough space to store USB cables, charge, and have Extra pocket to store memory cards,etc. each practical accessories you may use. Devices will be fastened with the inside security strap that can hold devices tightly | EVA HIGH-GRADE & WITH LANYARD AND METAL HOOK - which creats a hard texture and play a protection with the items that you have place in it. Perfect with lanyard and metal hook, you can just carrying the lanyard or use the metal hook matches lanyard fixed Storage Bag on your backpack, makes it easy to carry and very compatible for travelling.