A-Scan Ultrasonic frequency: 10MHz Display resolution: 0.01mm Total gain of receiver: ≥100dB Adjustable gain scope: 0～50dB Measuring scope (AL): 15 mm～40mm Measuring accuracy: ≤±0.05mm Measuring Parameter: ACD, LENS, VITR and AL Measuring mode: automatic mode or manual mode can be selectable. Automatic mode for Normal, Cataract and Aphakic mode Measuring method: contact and immersion, can be selectable IOL calculation: SRK/T, SRK-II, BINK-II, HOLLADAY, HOFFER-Q, HAIGIS, and IOL calculation formula after corneal refractive surgery: HISTORY DERIVED, DOUBLE-K/SRK-T, REFRACTION DERIVED, ROSA and SHAMMAS. Pachymeter Ultrasonic Frequency: 15-20MHz Display Resolution: 1μm Biometry Accuracy: ≤±5μm Measuring Scope: 230-1200μm