Memory Video Door Phone is a fashion video door phone with indoor monitor and outdoor camera.
Outdoor camera is 0.3M pixel and night vision.
Indoor monitor is 7 inch color monitor with memory function. When have visitor press doorbell, can take a picture automatically, also support to take photo manually. It support to store 100 pcs pictures and cycle replace.
Memory Video Door Phone Memory Video Door Phone,Take Photo Video Door Phone,Photo Recording Video Door Phone,Video Door Phone With Memory Shenzhen Zhuohao Intelligent Electronic Development Co., Ltd. , https://www.szactop-smart.com
Which fish farming bodies should not use lime
Quicklime is a commonly used substance in the prevention and improvement of water quality in current fishery production. The rational application of quicklime in some fish cultures can neutralize excess acid, precipitate toxic metal ions, kill fish pathogens, promote the condensation and decomposition of organic matter and suspended matter in water, reduce oxygen consumption, and improve water productivity. positive effects. However, there are some places that have abused quicklime for ignoring the specific conditions of water quality, resulting in reduced production. So, which types of water should not use lime? Generally speaking, there is already a large amount of calcium ions in the water and sediments, and lime in the alkalinity ponds should not be used. Since lime is applied again, the phosphate precipitation is fixed more and more completely, and the concentration of available phosphorus in the water is reduced, resulting in lack of water bodies. Phosphorus affects or even limits the growth of aquatic plants, resulting in low yield of fish culture. In addition, some organic matter in the water body is insufficient (such as newly excavated fish ponds). If lime is used alone, the organic matter will be intensified and the fertility will be further reduced, which will also result in low yield. The prevention method is: Before the use of quicklime in aquaculture water, the total acidity and total hardness of the water body should be tested, and it should be known that the thin water body should use organic fertilizer or phosphate fertilizer while using quicklime.