This is a simple tool that gauges how many Chinese characters you know. Since it's built on self-grading, you can yourself decide how you want to take the test. Do you want to check how many characters you recognise? Or maybe how many you can read out aloud? Or perhaps how many you can form at least one word with? Just answer accordingly! The tool tries to adjust which characters it shows depending on what it thinks your total number might be, so it gets more and more accurate the more characters you see. If you want a more powerful tool that goes beyond 5,000 characters, check 汉语识字量测试 (Chinese character recognition test).