Uncle's birthday, I plan to send a fishing rod for advice.

Generally speaking, fishing rods can be divided into hand rods and sea rods. The length of the hand pole is generally 3.6-7.2 meters, and the short pole is 2.5 meters. It is often used for fishing on the edge or in tents, and is made of bamboo pole, reed, glass fiber reinforced plastic, carbon steel and other materials. In order to facilitate carrying and storage, people have long known how to make fishing rods into multiple sections, one thicker than the other and interspersed with each other. The number of sections varies according to the length and material selection. Some segments are 80- 1 1 O cm, * * * 4-5 segments. Some sections are only 60-80 cm long. When not in use, the details penetrate into the thick part, and finally only penetrate into two parts. Before the 1950s, the best reed double fishing rod was made in Japan. Later, FRP was invented, and then carbon fiber was invented, which was light and durable. Instead, the sections are sleeved together according to the thickness, and it is very convenient to draw them out from the inside out when using. It can also be made of aluminum, which is relatively light. In contrast, carbon rods are lighter than FRP. It has good toughness and is the most advanced material rod at present. However, it must be noted that it is very conductive and cannot be used under high-voltage lines or thunderstorm weather. When buying a fishing rod, you should pay attention to whether the roundness of each section of the fishing rod is symmetrical, whether the thickness is even and moderate, whether the socket is firm, whether the rod body is straight, whether the bottom handle is closed, and how heavy the whole fishing rod is. The hardness and toughness of fishing rods are often expressed by "tuning". Generally, it can be divided into soft, medium and hard tones. The timbre refers to the firmness of the fishing rod and the bending amplitude of the fishing rod after being stressed. The small amplitude is hard tone, and the large amplitude is soft tone. When lifting the fishing rod horizontally by hand, the front part must be bent, and the ratio of the length from the starting point of bending to the tip (that is, the bent part) to the whole fishing rod is used as the expression of timbre hardness. If the bending part accounts for 2: 8 of the total length, it is called 28 tones, which is hard; The proportion of panax notoginseng is in the middle; The ratio of four to six is very soft. Of course, it can be further subdivided according to the bending ratio. Generally speaking, fishing for small fish requires quantity and speed, and hard tuning is better. Adjusting the big fish In order to avoid too much stress at once, it is better to choose adjustment or soft adjustment. The length of sea pole (also called cast pole) is generally 1.65-3.6 meters. 2-6 sections, each section is equipped with a wire ring for fishing line to pass through. There is a device for installing the scroll at the bottom. There are many kinds of reels with different grades, which should be selected according to personal needs and economic conditions and be practical. We should know and understand the meanings of various labels on fishing rod packages. Because this is the main technical index of fishing rod composition, it is also the main basis for us to quantitatively analyze a fishing rod. These indexes include: total length, number of knots, contraction length, head diameter, yuan diameter, self-weight, materials used, carbon content, net fishing weight and fishing property. By understanding the meaning of these indicators, we can find out the connection and logical relationship between them. Full length: used to indicate the total length of the fishing rod after it is completely pulled out or inserted. Commonly used sizes are: 3.6m, 4.5m, 5.4m, 6.3m and other different specifications; Knot number: used to indicate how many knots this fishing rod consists of. Common specifications are: 4, 5, 6, 7, 8, etc. Contraction length (also called Wu Shi inch method): refers to the length of the fishing rod after contraction. Generally, it can be divided into three types: long-section bar (above 100 cm), medium-long-section bar (about 60 cm) and short-section bar (about 30 cm). First diameter (also called front diameter): refers to the diameter of the thinnest part of the pole tip. Yuan diameter (also called back diameter): refers to the diameter of the thickest part of the rod tail. Self-weight: refers to the weight of the fishing rod itself. Materials used: refers to the main materials used to form the rod body. Mainly includes: FRP fiber, carbon fiber, high carbon fiber and bulletproof fiber and other different materials. Among them, the strength of carbon fiber cloth is expressed in tons; Carbon content: used to indicate the ratio of carbon fiber to total fiber. Net fishing weight: refers to the maximum weight that a fishing rod can catch at rest. Fishing property: refers to the hardness of fishing rod, and can also be used to indicate the bending degree of different fishing rods when they catch the same specified weight. Generally, it can be divided into alto, soft tone, hard tone, ultra-hard tone and extremely hard tone, and can also be expressed by 19 tone, 28 tone, 37 tone, 46 tone and 55 tone. Secondly, according to these connections and logical relations, the inherent quality of fishing rod can be calculated. For example, self-weight is determined by total length, number of joints, shrinkage length, head diameter, element diameter, materials used and carbon content. Assuming that the total length, number of joints, shrinkage length, head diameter and element diameter are unchanged, the material used and carbon content are all functions of the self-weight of the rod. On the premise of ensuring the weight of the net, the lighter the weight, the higher the quality! On the other hand, only by using high-tonnage carbon fiber cloth and increasing the carbon content of the pole can the self-weight be reduced. If there are two fishing rods with basically the same index, the lighter one should be of higher quality. Of course, we should also consider whether the workmanship is exquisite, whether the painting is exquisite and whether the price is appropriate, but these are not within the scope of quantitative analysis. By analogy: if the indicators of the two fishing rods are basically the same, then: the light weight is better than the heavy weight; High net catching weight is better than low net catching weight; The quality of fine element diameter is better than that of coarse element diameter; The quality with high carbon content is better than that with low carbon content. This is a simple quantitative analysis method, which can help us understand the fishing rod rationally and is also a reference for the design, manufacture and pricing of fishing rod. After understanding the meaning and logical relationship of each index of fishing rod, we can first determine the main performance index of fishing rod according to the purpose of purchase, and then choose fishing rod according to this index. For example, if we want to catch large fish such as carp, grass, herring, silver carp and bighead carp, the first indexes we should refer to should be net weight adjustment, tonality and total length. These three indicators are determined, and other indicators can be combined according to the cost performance. High-priced fishing rods are not necessarily the best for us. Only rational cognition can achieve rational consumption.