Product Description

Features •PD Meter is a digital precision optical instrument used to measure distance between human pupils in the process of optometry. •This device is designed in a scientific and reasonable way, integrating technologies on optics, microelectronics. •The corner reflection light coincidence method is used. •This operates by aligning luminous point on the pupils with measuring line. •Results are displayed digitally. •measurements are given: right, right+left, left. •Results are accurate to within 0.*5mm. •Measurements can be made for a single eye or for both eyes. •Possible to measure PD of focusing-point distances ranging from *0cm to infinity. • Automatically switches OFF one minute after operation is completed, thus conserving power. •Distances from tops of the corner to lenses or frames can also be measured . Specification Data show range two eyes PD: *4~*3mm Left-right PD: *2~*1.5mm Effective measure range two eyes PD: *5~*2mm Left-right PD: *2.5~*1mm Indication error ≤0.5mm Rounding error ≤0.5mm Target distance *0cm~∞ Power supply voltage: DC 6V Specification: 5#AA battery Quantity: 4 Automatic shut-off 1minute after operation stops Instrument size **2mm（L）×**8mm（W）×*8mm（H） Net weight 0.6kgs