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I also lost the battery cap for the LR550. I signed up for an account on Nikon.com and asked how to get a replacement through the "Service and Support" section. Very delighted to report that they immediately FEDEXed a replacement part - free of charge!!! Love my range finder, disappointed that the cap fell out but impressed with the service. Will put some tape over the battery cap from now on.
Harbor Freight has a kit that has them in it and most industrial tool supply companies have them. It's a security screw. there are many kits availably with an assortment of bits in them. Drill Master has a 100 piece kit that's pretty cheap. Item#91310
On that home page, look down the left side of the page and you will see a variety of choices to click on. You will click on 'DOWNLOADCENTER'. Then, on this SAME page, look in the middle of the page and you will see a choice 'SPORTS OPTICS' which you will click on.
This will take you to the NIKON ANSWER page.
Scroll down the page until you find the 550, there's two(2) models of the 550 determine which is yours, then look over to the right hand side of the page and you will see the PDF/ADOBE logo which you will click on and in turn this will show you the OWNERS MANUAL which you can download and there you have it. Good luck. :)
First, be sure and focus the eyepiece on what you desire to measure distance to. Begin the measurement with the range dial set to minimum. Slowly tury the dial until the grey-blue image and the yellow image overlap each other. Read the measurement. If you suspect it is in error, you can calibrate the 400 or 1000 or 1200 by turning the screw slot within the range dial using an object you know the distance to. If the two images are off in the vertical direction, there's a screw below the range finder to adjust that. Turn it very little. Regarding the model 610, mostly the same except to calibrate it, merely spread the adjustment knob apart (spring loaded) and turn the part of it nearest your eyes so the yardage matches the distance.