Note: As shown in the figure, the 4mm lens is very wide and the whole image can be seen. Everything but the details of the small thing 3 meters away is not clear enough, as the figure can only see the car. The 16mm lens looks far away. The car in the picture can be monitored very clearly. Even the license plate number can be seen very clearly, but the monitored area is relatively small. In the first 10 meters of the camera can not see the object, we have to choose according to their actual situation.
4mm within 6m, 6mm within 10m, and 8mm within 20-30m are recommended to ensure wide and far view. It is recommended to use 12mm over 35m.
A good honing steel is essential for keeping knives sharp and at the ready. This durable version is crafted of high-carbon-steel and restores a knife's sharp edge by trueing it – that is, smoothing and realigning the blade's cutting edge to help it stay sharper longer.Maintains the razor-sharp edge of most knife blades between sharpenings; do not use on serrated or scalloped blades.Our PP Handle Sharpener sturdy high-carbon steel resists stains and corrosion.PP Handle is contoured for a comfortable grip.Use with straight-edged knives only; not for use with serrated blades.Steel length should measure at least as long as the knife being honed.Hone knife before each use to maintain the sharpest edge.To properly hone the knife, hold it at a 20-degree angle and draw the blade across the steel. Never stroke the same side of blade more than once in succession.
PP Handle Sharpener,PP Handle,PP Grindstone Handle ,Handle Sharpener
YangJiang Victory Kitchenware Products Co.,LTD. , http://www.victory-kitchenware.com