Meter Hardware. 3.1. A push button for reading the display manually must be provided. And this list of registers shall be separate from the auto cycle mentioned in Item (2.15). 3.2. The meter shall have the facility to be read even if the power is not present. 3.3. The battery shall be changeable easily (inside sealed cover) and the lifetime shall not be less than 15 years which has to be approved. And the meter shall continue to operate even if the battery is lost for any reasons. The battery should not be used if the meter is connected to power. 3.4. The lifetime of the offered meter has to be not less than (20 years) which has to be confirmed by an official certificate.
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Sources: Call Off Contract, Call Off Contract