... Anti-vibration and anti-shock, Anti-vibration,complies with the standard of IEC60068-2-6. frequency ... vibration time,15 min. Anti mechanical shock,complies with the standard of IEC60068-2-27.Accuracy level, ... other meters have pre-positive zero regulator, used to adjust the meter’s mechanical zero.Benefits of the ... is the same, you can replace the dial with the accuracy unchanged. As for the DC ammeter ...