NEW - forensic photography image calibration rectification color gray scale. credit card size matte finish non reflective high quality pvc -card measurements: 3 3/8" x 2 1/8" -card has 1 inch and 1 centimeter measurement ruler for quick visual reference of specimens -use this card to photograph specimens, jewelry, ebay items. use it to focus and calibrate your camera, photograph the card to quickly check the lighting on your digital camera. easy to carry credit card size fits into your wallet so you will always have it handy -please see all photos and contact me with any questions before making your purchase. thank you for shopping! *Listing is for one (1) Brand new card exactly as shown in photo. * I DO NOT SHIP TO GUAM SORRY PLEASE DO NOT PURCHASE ITEMS IF YOU ARE BUYING FROM GUAM