Light meter Sverdlovsk-4 (экспонометр Свердловск-4) battery case
thingiverse
This is the first version with two batteries. First, this light meter was pack with tiny battery for 3.75 volt and 0.25 Ah. But on the back of a light meter was written: possible currency: 3-4 volt. Now, when i use two AA acumulator battaries i have only 2.75 volts. But it still works. But i am not sure about accuracy of it measurement. So, nest version i want to use dc-dc step up converter to give 3.7 volt. Fusion 360 source file included, so you are welcome to improve this
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