The Haag-Streit Applanation Tonometer T 900 can be used in combination with any BM or BQ slit lamp, and is mounted on the guide plate over the slit lamp axis. Based on the Goldmann principle, Goldmann applanation tonometers are considered the best instrument to measure intraocular pressure. Haag-Streit production assures reliable performance and longevity along with the best reproducibility and accuracy. Gold standard in IOP measurement Best reproducibility and accuracy In combination with any slit lamp Reliable and durable Reusable and disposable tonometer prisms