Optrel crystal 2. 0 welding helmet 1006. 900 the Optrel crystal 2. 0 Auto-Darkening welding hood features shade 2. 0 light state that is unmatched in the world for color and clarity. The crystal 2. 0 lens has fully automatic shade 4 to 12 Arc brightness detection with Twilight feature to gradually bring the lens back into light state from welding state, reducing eye strain. Optra autopilot automatically adjusts the shade level based on the brightness of the arc or flame. The Auto-Dark lens can also be operated in fully manual mode with infinite shade adjustment between shades 4 and 12 for a custom view of the arc. The crystal 2. 0 welding helmet also has improved true color Technology, which allows for realistic color perception in light or dark States. It scores a perfect 1 rating for optical class, scattered light, homogeneity and angular dependence. The crystal 2. 0 has external controls to switch quickly and easily from weld to grind mode and back again. Delay and Sensitivity can also be controlled using the external knobs. True color - The color perception in light state is almost like looking through clear window glass and in dark mode, you enjoy a detailed and high-contrast view of the welding pool with never-seen-before clarity. True color passes more colors of the spectrum through compared to standard "Green" Spectrum welding lenses. External lens controls include infinite shade 4 to 12 adjustment, delay and infinite sensitivity Adjustment and allow for Quick switching between weld and grind modes without removing the welding hood. Heat reflecting paint - helps welder stay cooler under the hood. Patented sensor slide allows the detection angle to be reduced from 120° to 60° to prevent the ADF from responding to welding nearby. Patented Exciter perfectly centers the welding helmet when in open position for better comfort, balance and less neck fatigue. Comfort headband quickly and easily adjusts for size, forward position and top Position.