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Senior Engineer, Yilin
Customer Reviews
Our team has been using ERDI products. They provide excellent services and can quickly solve the technical problems of the products. In particular, the perfection of their entire industrial chain in the field of distance measurement has greatly facilitated our secondary development
We are very grateful to the technical engineers of ERDI for their on-site technical guidance at our company. Their visit has accelerated the research and development of our unmanned aerial vehicle (UAV) system. The products of ERDI have demonstrated remarkably stable performance.
We're extremely thankful to ERDI's engineers for coming to our office for detailed product training. Their expertise in communication modules has been a huge boon for our telecom project. The ERDI communication products we've incorporated into our system have shown outstanding stability, significantly enhancing the efficiency of our R & D work.
FAQ
We are a national high-tech enterprise in China. For each product, we cover the entire industrial chain, ranging from research and development to manufacturing, and then to technical service solutions.
We provide samples and will try our best to keep the fees as low as possible. If you are our regular customer, we will offer some free samples.
You can contact sales online to get latest price; Or you can leave message to us. Our sales will contact you as soon as possible. And the price we provide is normally FOB price.
We accept payments via T/T, PayPal and LC.
Our minimum order quantity is 1 pc.
Please contact sales to confirm if we still have goods in stock. If yes, we will ship goods to you in one week time after we receive your payment. If not, please confirm with sales.
Usually we ship goods to customer via express, such as DHL, FedEx, UPS, TNT or airway transportation. You can also ask us to send goods to your forwarder in China. And we will pay domestic freight.
Yes, we provide OEM/ODM service. Lead time of customized products need to be confirmed with sales. Usually we will ship products after 2 months time after we receive customer’s payment.
Our skilled and friendly salesmen are ready to answer your questions about our products and services at any time, from product selection to application. Free technical consultation services are offered by request. Our experienced engineers are here to cooperate with you on your special requirements or OEM designs.
The specifications of our products are subject to change without notice. Please ask necessary questions before you order.
Laser products are warranted to conform to ERDI’ s published specifications and to be free from defects in materials and workman-ship for a period of twelve months starting on the shipping date. ERDI will repair or replace (at our decision) ASAP without charge, any part(s) found to be defective during the warranty period.
Our warranties do not cover damages due to misuse, negligence or accidents or due to installations, repairs or adjustments not authorized by ERD.
If a problem occurs and can’t be solved by phone, fax, or email, you may return products to ERDI. Please contact us for a Return Material Authorization (RMA) number prior to shipping the laser. We’ll provide you details on shipping and customs information with the RMA number. All lasers and components should be carefully packed to avoid damage during shipment.
Why do snipers still use optical rangefinders that require tedious calculations even though there are laser rangefinders?
- Yilin
- No Comments
In the evolution of sniper rifles, the method of range estimation has always been a crucial factor – without precise distance, a shooter cannot accurately adjust the bullet’s impact point, thus achieving a first-shot hit on the target.
Image: The M21 sniper rifle incorporated an intricate mechanical structure to enable soldiers to estimate range without calculations, ultimately proving to be a dead end.
Throughout this process, various nations have taken numerous detours in developing sniper rifles. Precise optical range estimation involves complex calculations, requiring shooters to possess higher educational levels and relevant skill training. In recent years, with advancements in optoelectronic technology, miniaturized laser rangefinders have become widely prevalent, leading many to believe that snipers only need a laser rangefinder.
Image: The mil-dot reticle, which necessitates extensive and precise calculations, remains the mainstream choice for professional snipers.
Relying solely on laser rangefinders to replace optical range estimation through scopes/observation devices is a very hasty and dangerous practice. Firstly, in atmospheric conditions such as rain, fog, or smoke, laser beam attenuation is significant, causing the maximum detection range of laser rangefinders to drop to one-third or even lower.
Secondly, in complex environments, the laser beam may not actually illuminate the target. For instance, when attempting to range a target 900 meters away, the laser beam might instead hit grass or leaves at 600 meters.
Image: Laser rangefinders should only be used as an auxiliary tool.
Especially considering factors such as countermeasures against laser-guided weapons – like laser-guided bombs and laser-guided artillery shells – modern military forces of powerful nations have begun widely equipping anti-optoelectronic surveillance devices. Recklessly using a laser rangefinder could easily expose the sniper’s position.
Therefore, with current technology levels, snipers will greatly benefit from using laser rangefinders when conditions permit; however, the fundamental skill of optical range estimation remains indispensable and must be firmly mastered.