The MST Braunstein Fixed Caliper (Item #AR0155) is a purpose-built ophthalmic instrument in the Calipers, Gauges & Markers portfolio. Aphakic: 3.5mm. Phakic: 4mm. Overall length: 80mm. This combination of thoughtful design details and clearly defined specifications helps surgeons quickly identify the configuration that best fits their preferred technique and procedural needs.