A thermometer-hygrometer is a measuring instrument used to detect changes in ambient temperature and humidity. It is widely applied in industries, agriculture, environmental protection, meteorology, medical care, national defense, aerospace and military industries, as well as daily life and warehouse environment management. With the development of science and technology, people are paying more and more attention to the detection and control of temperature and humidity, and the requirements for the accuracy of temperature and humidity parameters are also increasing. Then, which brand of thermometer-hygrometer is the most accurate? How to set the time in daily use? ### Working Principle of Thermometer-Hygrometer Thermometer-hygrometers are widely used, and the accuracy of their use directly affects work efficiency. Therefore, it is crucial to do a good job in the verification and calibration of thermometer-hygrometers. To better complete the verification and calibration work, it is first necessary to clarify the working principle of the thermometer-hygrometer. There are many types of thermometer-hygrometers, which are selected reasonably according to usage needs. Their principles are roughly similar, but relevant verification and calibration personnel need to grasp the working principles more accurately. Prepare two identical thermometers: one used to measure the real-time temperature is called a dry-bulb thermometer, and the other is wrapped with a cloth soaked in pure water, with the other end of the cloth ball placed in pure water, which is called a wet-bulb thermometer. The working principle of the thermometer-hygrometer mainly relies on calculating the humidity based on the temperature and humidity, dryness and wetness in the atmosphere. Only by mastering the working principle of the thermometer-hygrometer can it be more conducive to carrying out the verification and calibration work, thereby ensuring its effective operation. ### How to Set the Time on a Digital Thermometer-Hygrometer 1. Press the "SET" key to enter the time adjustment mode, and the hour on the screen will start to flash. 2. Adjust the hour using the "UP" and "DOWN" keys. After adjustment, press the "SET" key, and the minute will start to flash. 3. Adjust the minute using the "UP" and "DOWN" keys. After adjustment, press the "SET" key, and the year will start to flash. 4. Adjust the year using the "UP" and "DOWN" keys. After adjustment, press the "SET" key, and the month will start to flash. 5. Adjust the month using the "UP" and "DOWN" keys. After adjustment, press the "SET" key, and the date will start to flash. 6. Adjust the date using the "UP" and "DOWN" keys. After adjustment, press the "SET" key, and the time adjustment is completed. ### How to Set the Time on a Digital Thermometer-Hygrometer with "clock/humidity"? 1. First, press the "mode" key to enter the setting mode. 2. Select the option to adjust, such as "clock" or "humidity". 3. Press the "set" key to make the number of the selected item start to flash. 4. Use the "+" or "-" key to adjust the number; each press will increase or decrease the value of the number. 5. Press the "set" key to save the changes. 6. Exit the setting mode and return to the normal display mode. ### The Most Accurate Brands of Thermometer-Hygrometers 1. **Yuhuaze Thermometer** Recommended product: Yuhuaze large dial indoor thermometer-hygrometer Yuhuaze's thermometer is a well-known brand in the domestic thermometer field. Its products enjoy high popularity and sales volume, with reasonable prices and good overall reputation, making it one of the leading thermometer brands in China. 2. **Shengni Shangpin Thermometer** Shengni Shangpin indoor and outdoor thermometer-hygrometer TH101B Shengni Shangpin is a domestic enterprise mainly engaged in household products, covering laundry and drying products, bathroom supplies, kitchen utensils, storage items, festival aromatherapy products, etc. It is a brand with a relatively complete range of household products, and also sells thermometers, which have reasonable prices and good sales volume on domestic e-commerce platforms. 3. **Fangke Thermometer** Recommended product: Fangke FK household indoor dry and wet thermometer Fangke FK mainly focuses on household products and has a strong presence in e-commerce. It sells well in small daily necessities such as置物架 (shelves), thermometers, and hooks. 4. **Lvyuanzhi Thermometer** Recommended product: Lvyuanzhi table and wall dual-purpose large dial thermometer-hygrometer This is Lvyuanzhi's thermometer. Lvyuanzhi is well-known in China for its purification and formaldehyde removal products and has a high reputation in the air purification field. Of course, this brand also produces its own thermometers, which are sold on some e-commerce platforms with good sales volume. 5. **Yagao Thermometer** Recommended product: Yagao indoor thermometer-hygrometer with large dial Yagao's thermometer-hygrometer has good sales volume on e-commerce platforms. Yagao, like Shengni Shangpin and Fangke FK, is a brand engaged in small household products and has high sales volume in certain small household product categories. 6. **Deli Thermometer** Recommended product: Deli table and wall dual-purpose indoor household thermometer Deli is a brand specializing in office supplies and is one of the top brands in the office field with high brand awareness. Deli also sells thermometers, which have a large sales volume. On some e-commerce platforms, Deli thermometers can have hundreds of thousands of user reviews. Source: *Commodity and Quality*, *Miguanyi*