Features 
2.1 Max. Display: 4000 Counts (3 3/4 digits). 
2.2 Conversion Rate: 3 timesc. 
2.3 The Negative Indication: Auto. 
2.4 Power Voltage Range: 2.4V〜〜〜〜3.6V. 
2.5 Chip Power Consumption: ≤6mW. 
2.6 Low Battery Warning: Approx. 2.4V. 
2.7 Buzzer Driver Circuit (Frequency is about 2.7kHz). 
2.8 RS232 Serial Data Output 
2.9 Embedded OPAMP for AC/DC conversion. 
2.10 Function Keys: Range, Hold/BLCTR, Rel, Select, Hz/Duty, RS232 and Reset. 
2.11 Unit Symbol and Backlight Display. 
2.12 Auto Power-of