This is a nice Hasselblad PME meter good for most Hasselblad cameras, including the very early 1600F/1000F, V Systems and F System. Photos shown here is on my Hasselblad 1000F with a very nice Kodak Ektar 80/2.8.
The reading is in EV so ideal for 500 series cameras. Use 6V battery. With eyepiece, eyecup and a like new cap. If you need metering and also image on correct orientation, this is it.