The Tono-Pen is a handheld device thatâs shaped like a large marker. It provides a digital readout of eye pressure. Your doctor can use it to touch your eye and measure pressure. Though useful in many cases, the Tono-Pen is considered less accurate than the Goldmann tonometer in people with normal corneas.
The English language has two types: British English and American English. Other variations such as Oxford English, Standard English, or other variants are mere adaptations of the two types (especially for consistency or reference use, e.g., in media or publication). British English.
The answer is that the Chinese varieties are primarily spoken within a single nation, while the latter are spoken in different countries. Hindi and Urdu are almost identical, yet considered to be different languages because they are associated with different countries (India and Pakistan), religious beliefs (Hindu and Moslem), and different writing systems (Devanagari and Arabic).