This quartz bonnet is used with Optima 3000, 3000 SCR, and 3x00 RL ICP-OES series instruments. This quartz bonnet is used with Optima 3000, 3000 SCR, and 3x00 RL ICP-OES series instruments. This quartz bonnet is used with Optima 3000, 3000 SCR, and 3x00 RL ICP-OES series instruments.