SPECIFICATIONS Operating Temperature 14° F to 138° F (-10° C to 59° C) Quartz Crystal Accuracy 0.1 sec/hr (accuracy may vary with shock, temperature or aging of crystal) Batteries Batteries should last for 3 years. If display becomes dim, open back. Replace with Duracell D357, Eveready D357 or Ray-O-Vac RW42 For best results use Silver Oxide Battery.
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