pd Meter

PD meter #HX400: 1.LED lamp, with brightness adjustable2.Switch, with which instrument can be turned off by handor preset to go off automatically in 0.5 3 minites3.+2.0D Prism compensation4.LED power, 2pcs batteries can be used for 3 months5.no spray-paint on the surface. Still looks new after using 3 5 yearsbinoculus pupil distance:45∼82mmMonoculus pupil distance: 22.5∼41mmEye release range:30cm∼∞Indication error:≤0.5mmSymmetry error:≤0.5mmRound error: ≤0.5mmPower: #5 AA battery x 2Dimension: 233mm×165mm×70mmWeight: 680g