And since these are air-activated batteries they'll go dead within a month even with the meter turned off. So I usually rely on an old hand-held light meter or just bracket my exposures on the rare occasions I use the camera. Digital is so much more convenient--not to mention economical--it's no wonder people donate their film cameras to charities. I only wish the garden-variety digicams had the quality lenses Pentax and their competition made in the '60s and '70s.
There is no switch on the K1000, if you forget to cap the lens the meter will kill the battery.