The Spectra Polaris PQ 512/15pl is a high performance inkjet print head designed for a broad range of industrial and commercial printing applications at resolutions up to 1000dpi, Robust construction and repairable design make it ideal for solvent and UV wide format printers built for demanding production environments. Features: 1, 15 picoliter calibrated drop size; 2, 512 individually addressable nozzles; 3, High frequency continuous operation; 4, Optimized for high viscosity jetting fluids. Original and brand new and in stock! Parameter Nova JA 256/80 AAA Number of addressable jets 256 Nozzle spacing 279 microns (0.011 in. ) Nozzle diameter 52 microns Calibrated drop size 75 picoliters Adjustment range for drop size 70-85 picoliters Drop size variation, 1 sigma 5% Jet straightness, 1 sigma 4 mrad Nominal drop velocity 8 m/sec Drop velocity variation, 1 sigma 5% Crosstalk, maximum 5% Operating temperature range Up to 90 degree Fluid viscosity range 8 – 20 cP Compatible jetting fluids Aqueous, organic solvent, UV curable Maximum operating frequency 20kHz