1.000 to 6000 cc/min range Soap film measurement method LED Display Compact, light and easy to use Dimension (inches) 5.5L X 6W X 2.50 Microprocessor controlled for fast, accuate repeatable measurements +/- 0.5% accuracy Works at any altitude Temperature limit 32º F to 104ºF 8-hr rated Ni-Cad battery