Use SR44 (silver oxide - uncommon) x 2 or LR44 (alkaline - easily found) x 2
Ricoh 35ZF
Now this is tricky, the mercury equivalent is no longer in production (PX-675) you can try either using SR44 or try your luck getting the battery from either P&G Cameras in Adelphi (David) or Camera Hospital (Steven).
To add on, PX675 you can use the zinc air equivalent 675 commonly found in NTUC and 7-11 in those hearing aid batteries. Constant voltage of 1.4V. Very accurate.
To add on, PX675 you can use the zinc air equivalent 675 commonly found in NTUC and 7-11 in those hearing aid batteries. Constant voltage of 1.4V. Very accurate.