PD-28

Range of measurement: 45 to 82MM (both eyes), 22.5 to 41MM (each eye)

Indication error: ≤0.5 mm

Rounding error: ≤0.5 mm

Range of focusing point: 30 cm~∞

Electric Voltage: DC 3V (5#AA battery×2 pieces)

Time of automatic shut-off: 1 minute