X: No output 
 Replaced by the following characters in the X, the instrument has all of the functions indicated by the corresponding character 
 K: Programmable digital meters. Optional RS485 interface, data exchange with PC. 
 D: In the programmable digital instruments based on the increase all the way or three-channel analog output. 
 Optional RS485 interface, data exchange with PC. 
 S: In the programmable digital meter adds two relay alarm output. 
 Optional RS485 interface, data exchange with PC. 

 1, Dimension: 160 * 80 * 125 (mm) Opening size: 151 * 76 (mm) Accuracy: 0.5 
 Digital AC voltmeter HD284U-1X1 
 Digital DC voltmeter HD285U-1X1 
 Digital AC ammeters HD284I-1X1 
 Digital DC ammeter HD285I-1X1 
 Digital active table HD284P-1X1 
 Digital Reactive Power Meter HD284Q-1X1 
 Digital frequency meter HD284F-1X1 
 Digital Power Factor Meter HD284H-1X1 

 2, Size: 120 * 120 * 75 (mm) Opening size: 112 * 112 (mm) Accuracy: 0.5 
 Digital AC voltmeter HD284U-2X1 
 Digital DC voltmeter HD285U-2X1 
 Digital AC ammeters HD284I-2X1 
 Digital DC ammeter HD285I-2X1 
 Digital active table HD284P-2X1 
 Digital Reactive Power Meter HD284Q-2X1 
 Digital frequency meter HD284F-2X1 
 Digital Power Factor Meter HD284H-2X1 
 Three-phase digital voltmeter HD284U-2X4 
 Three-phase digital ammeter HD284I-2X4 
 Three-phase active table HD284P3-2X1 
 Three-phase reactive power meter HD284Q3-2X1 

 3, Size: 80 * 80 * 85 (mm) Opening size: 76 * 76 (mm) Accuracy: 0.5 
 Digital AC voltmeter HD284U-3X1 
 Digital DC voltmeter HD285U-3X1 
 Digital AC ammeters HD284I-3X1 
 Digital DC ammeter HD285I-3X1 
 Digital active table HD284P-3X1 
 Digital Reactive Power Meter HD284Q-3X1 
 Digital frequency meter HD284F-3X1 
 Digital Power Factor Meter HD284H-3X1 
 Three-phase digital voltmeter HD284U-3X4 
 Three-phase digital ammeter HD284I-3X4 
 Three-phase active table HD284P3-3X1 
 Three-phase reactive power meter HD284Q3-3X1 

 4, Size: 160 * 60 * 125 (mm) Opening size: 116 * 56 (mm) Accuracy: 0.5 
 Digital AC voltmeter HD284U-4X1 
 Digital DC voltmeter HD285U-4X1 
 Digital AC ammeters HD284I-4X1 
 Digital DC ammeter HD285I-4X1 
 Digital active table HD284P-4X1 
 Digital Reactive Power Meter HD284Q-4X1 
 Digital frequency meter HD284F-4X1 
 Digital Power Factor Meter HD284H-4X1 

 5, Size: 96 * 48 * 85 (mm) Opening size: 91.5 * 44.5 (mm) Accuracy: 0.5 
 Digital AC voltmeter HD284U-5X1 
 Digital DC voltmeter HD285U-5X1 
 Digital AC ammeters HD284I-5X1 
 Digital DC ammeter HD285I-5X1 
 Digital active table HD284P-5X1 
 Digital Reactive Power Meter HD284Q-5X1 
 Digital frequency meter HD284F-5X1 
 Digital Power Factor Meter HD284H-5X1 

 6, Size: 96 * 96 * 112 (mm) Opening size: 91.5 * 91.5 (mm) Accuracy: 0.5 
 Digital AC voltmeter HD284U-9X1 
 Digital DC voltmeter HD285U-9X1 
 Digital AC ammeters HD284I-9X1 
 Digital DC ammeter HD285I-9X1 
 Digital active table HD284P-9X1 
 Digital Reactive Power Meter HD284Q-9X1 
 Digital frequency meter HD284F-9X1 
 Digital Power Factor Meter HD284H-9X1 
 Three-phase digital voltmeter HD284U-9X4 
 Three-phase digital ammeter HD284I-9X4 
 Three-phase active table HD284P3-9X1 
 Three-phase reactive power meter HD284Q3-9X1 

 7, Dimension: 72 * 72 * 75 (mm) Opening size: 67 * 67 (mm) Accuracy: 0.5 
 Digital AC voltmeter HD284U-AX1 
 Digital DC voltmeter HD285U-AX1 
 Digital AC ammeters HD284I-AX1 
 Digital DC ammeter HD285I-AX1 
 Digital active table HD284P-AX1 
 Digital Reactive Power Meter HD284Q-AX1 
 Digital frequency meter HD284F-AX1 
 Digital Power Factor Meter HD284H-AX1 
 Three-phase digital voltmeter HD284U-AX4 
 Three-phase digital ammeter HD284I-AX4 
 Three-phase active table HD284P3-AX1 
 Three-phase reactive power meter HD284Q3-AX1 

 8, Size: 48 * 48 * 112 (mm) Opening size: 45.5 * 45.5 (mm) Accuracy: 0.5 
 Digital AC voltmeter HD284U-DX1 
 Digital DC voltmeter HD285U-DX1 
 Digital AC ammeters HD284I-DX1 
 Digital DC ammeter HD285I-DX1 
 Digital active table HD284P-DX1 
 Digital Reactive Power Meter HD284Q-DX1 
 Digital frequency meter HD284F-DX1 
 Digital Power Factor Meter HD284H-DX1 
 Three-phase digital voltmeter HD284U-DX4 
 Three-phase digital ammeter HD284I-DX4 
 Three-phase active table HD284P3-DX1 
 Three-phase reactive power meter HD284Q3-DX1