... and voltage, frequency, power factor, phase sequence, power, synchronization instructions and other non-power measurements. It has been widely used in a variety of ... of 1.5 or 2.5, power meter to the level of 2.5, frequency meter to the level of 2.5, and ... , all other meters have pre-positive zero regulator, used to adjust the meter’s mechanical zero.Benefits of the product (the dial ...