The scale can be easily changed without opening the front frame so that the class will not be influenced. - Update: 2009-02-25

this vibrating reed frequency meter with one row of horizontal reeds or with two rows of horizontally arranged reeds for connection to one main voltage,vertical arrangements on request - Update: 2009-02-25

be used both in 50Hz or 60Hz electricity networks displayed on a horizontal positional 5+1 impulse step type register equipped with an SO contact or convenient monitoring with external equipment - Update: 2009-02-25

imitate digital filter waves red and green numerical tubes display PV and SV simultaneously digital PID adjustment - Update: 2009-02-25