Haag-Streit Goldmann Tonometer for BM900 Slit Lamps The Goldmann Tonometer features reliable performance and high precision. It’s still the most widely used instrument to measure the intraocular pressure. Features The gold standard in IOP measurement Best reproducibility and accuracy Can be used in combination with most “BM900 style” slit lamps Reliable and durable Replacement or disposable tonometer prisms available