I got one of these: 10x25 Monocular hunting Laser distance meter Golf rangefinder measurement Range finder medidor de distancia a laser luneta-in Laser Rangefinders from Industry & Business on Aliexpress.com | Alibaba Group
Seems to be pretty accurate and the furtherest I have ranged is about 700m. The only annoying thing is that you need to take the battery out when it's in a pack otherwise the buttons keep getting pressed and it drains the battery.
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