Exterior reading Prism Compensation

Technical data:
Eyepiece focusing range: ± 5D
The top point dioptre measuring range: -25D~+25D
The minimum measuring square value: 0.125D
The shuttle lens measuring range: 10Δ
The shuttle lens square value: 1Δ
The cylinder lens axial range: 0-180°
The cylinder lens axial square value: 1°
The maximum diameter of the measured lenses: 100mm
The lighting: AC 220v/110v-6v DC 3v