Pentax, Asahi 2x Clip-On Meter | Light meter

2 pieces of Asahi Pentax plug-on exposure meters Model II with 1 case. Very sensitive CDS light meter that fits on top of the camera body’s viewfinder prism and works together with the camera’s shutter-speed knob. The light-sensitive element is a cadmium sulfide cell with a light-entry window and infrared-filtering glass. Small and light, 129 grams. The needle immediately indicates the correct aperture. The sensitivity is adjustable from 6 to 1600 ASA. Aperture range from 1.4 to 22. Forms a nice optical unit with the camera. It is from the renowned Copal brand as the 2nd model. There are two metering ranges for bright and low light. The power supply was original with the 1.3-volt mercury battery PX13 or 625. Due to the mercury ban, switched to the Kanto adapter with a voltage-lowering diode to 1.35V. Nowadays it uses a 675 hearing-aid battery with an adjustment ring. Costs a few euros. One is missing the clamp piece around the viewfinder. There is one original case present. The offer is without camera and lens cap.