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The Gold Standard for Superior Performance Haag-Streit measuring prisms are the gold standard for optical and mechanical performance, allowing for fast and reliable measurements. Features Handmade by experienced workers and checked for low tolerances in weight, optical quality, durability and for consistent measurement results Excellent quality for precise measurements with the Goldmann Applanation Tonometer Note: Reusable prisms have a shelf life of five years, within that timeframe they should be used for a maximum of two years, to ensure maximum safety. Before use each prism should be carefully checked for cracks, wear, etc.