Weston Pixie Exposure Meter, Model 548. 1968, USA manufacture.
A housing was made for this meter which allowed it to be used underwater. This was probably because, once set to the film in use, it required no further dial adjustment to read off the aperture setting. In other respects, this meter was commercially unsuccessful. In returning to the philosophy of the convenient but limited Direct Reading meter, they found themselves out of step with camera developments:
Serious amateur photographers would use a full-featured meter such as the Ranger 9. Snappers were, by the mid '60's, using cameras such as the 'Instamatic' which did not have, nor need, a range of apertures and shutters.
There is anecdotal evidence that the Pixie meter was popular with cine enthusiasts. Kodachrome II is one of the films listed on the meter and had been introduced as an 8mm cine film at the time. This would have been a very convenient meter to use alongside.