Product Description Emerald QE-256/30 AAA Printhead It is designed to eject adjustable 30 to 80 picoliter drops in binary jetting mode or a 30-picoliter fundamental drop in grayscale mode. This is done at a nominal 8-meter per second drop velocity when jetting fluids in the 10 to 14 centipoise range. Unparalleled flexible modes of operation include adjustable binary drop size and grayscale capability. Robust field proven metal nozzle plate technology provides precise drop placement accuracy of a wide variety of ink types, including UV-curable, solvent and aqueous.