If you need to calibrate your computer monitor, look into the Spyder from Datacolor. The SpyderX is an easy lens-based tool for calibration that utilizes technology capable of finishing the job in 2 minutes or less. Accuracy is reflected in precise shadows, white balance, and screen color, even if you are not an expert. Digital photographers should not let their screens go uncalibrated, so a tool like this helps them see a great representation of the shots they take. Furthermore, the software is intuitive and the integrated ambient light sensor helps users adjust their display brightness/contrast depending on the time of day. The item weighs 10.2 ounces and measures 3 x 3 x 1.75 inches.