This model has a microprocessor based lineariser for non-linear curves. The microprocessor calculates values by using a piecewise linear algorithm between the standards fed in to the unit. The range is defined by the highest standard used for the lineariser . The display can be changed to the normal mode where the unprocessed output is displayed. Ordering Information AIM 049100 – Digital Dual Channel Flame Photometer with Sodium and Potassium filters and oil free diaphragm type compressor. AIM 040103 – Lithium Filter 12.7 mm dia AIM 040104 – Calcium Filter 12.7 mm dia.