My daughter recently "inherited" some older camera equipment from her grandfather. I have been able to get the Asahi Pentax and associated lenses cleaned and working. However, she also got a very old light meter. The markings indicate it is a "Gossen Sixtomat Electronic cds". It has no batteries or manual. If anyone could help me locate information about this light meter it would be great. I have googled this information to no avail. Although new and better equipment is now available, my daughter really enjoys photography with older equipment and this would be a great addition.