... 2.Data-hold switch 3,high quality Digital llluminance meter Features 1,Light-measuring levers ranging from ... for easy reading .5.Automatic zeroing 6.Meter corrected for Luminous Efficency function .7.Correction ... Specifications 1. LCD Display :3-1/2 Digital with a maximum reading of 1999,and the ... ,when HOLD mode is selected ,the illuminance meter stops all further measurements ,Pressing the HOLD key ...