Swimming pool underwater where can I sell it

What instrument can detect whether the water in the swimming pool is dry? Where can I sell it
 Of course, Shanghai Haiheng water expert brand special swimming pool detector is preferred. The dz-y swimming pool detector produced by Shanghai Haiheng has a full Chinese operation interface. Easy to use and operate. It can measure 8 parameters of residual chlorine / total chlorine / combined chlorine / turbidity /ph/ temperature / urea and cyanuric acid. The portable aluminum alloy box is not easy to be damaged and has the functions of data storage and printingIs there a middle point on the underwater sign line of the swimming pool
There is no middle point in the underwater sign of the swimming pool, and the underwater sign is actually similar to the runway. The same sign is to ask you not to swim. Wrong way to swim
Why is it that under the water of the swimming pool, looking up at the water, the water reflects like mercury? What is the principle_ Baidu
Due to the total reflection of water, what people see underwater is a funnel-shaped (V) field of vision, what they see in the middle of V is clear, and what they see outside V is turbid (it can't be said to be turbid, anyway, they can't see anything)
Why is it that under the water of the swimming pool, looking up at the water, the water reflects like mercury? Please explain the principle. Specifically
This phenomenon is called total reflection. It is because the refractive index of water causes part of the light emitted from the water to the air to be completely reflected. When the human eye is in that area, the water surface is particularly bright and feels like mercuryWhat games can you play underwater in the swimming pool
Generally, during the interval of our training, we usually play the game of guessing boxing under the water, and then we can breathe out of the water after winning. Or the copy is not distorted. Make others laugh or something. If you are not particularly good at swimmingThe most magical swimming pool in the world. Tourists can walk and breathe under the water. Their clothes won't get wet at all. What's the matter
This magical phenomenon, this magic, deeply attracts people's attention. Many people think it is false, but if you come here to experience it, you will find it is true. Their clothes will not be wet at all, and tourists can always stay under the water of the swimming pool without coming up to breatheUnder the water of the swimming pool, look up at the water surface. What is the water surface like
Yes: C because water is a light dense medium relative to air, looking up at the water surface from under the water of the swimming pool, the water surface will have total reflection, so it reflects like mercury
There is a magical swimming pool in Japan. You can walk freely under the water. What's the matter
This swimming pool is made of a ladder and limestone, so there will be an illusion that it is a very ordinary swimming poolHow deep is the water in the deep water area and shallow water area of the swimming pool
The regular swimming pool is 50m long and 25m wide, with an average water depth of 1.50M; The 50m swimming pool is divided into shallow water area and deep water area. The shallow water area is 1.20m -1.50m, the deep water area is 1.50M -1.80m, and the middle drainage of the deep water area is 2m deep; You should warm up before you go into the water, and study in shallow waterHow can I swim underwater while swimming in the swimming pool
Preparation: before entering the water, take several deep breaths, and then take a deep breath (the purpose of this is to increase the oxygen content in the blood and lungs and prolong the diving time); Water entry actions: (1) underwater diving: lower your head and chest, with your chin close to your chestHow to dive in the swimming pool
Diving in the swimming pool can be divided into two situations: "plunge" into the water and dive underwater. This uses "impulse" force as the main force, supplemented by posture. Diving from the surface of the water is based on the posture (breaststroke posture), which requires the technology and skills of breaststroke, but requires taking a deep breath and head to the bottom of the pool