IN-6263 schotkey diodes. Drops the 1.55v of silver oxide batteries to approx.1.35v. I've used them for years in the Olympus OM-1/1N. When you test the meter with your calibrated light test box, you'll see that the meter is linear though it may need a little tweeking through the regular adjustment method. Absolute accuracy may not be that critical if you are shooting color negative film (which has a wide exposure tolerance). If you need a couple of these diodes, $1 each + $8 S&H. Pay by paypal if you like., John, www.zuiko.com