I. POWER SOURCE:  Self-Powered (No Batteries) 

II. MAIN FEATURES 

✅   Self-Powered Testing  

✅   Smart Power Management (LCD Display ) 

✅   Multi-Chemistry Support 

✅   Emoji Status Alerts (GOOD/WEAK/POOR + battery voltage)  

✅   Magnetic Test Slots (One-Handed Operation)

✅   Single-Button Navigation (SELECT Control)

III. COMPATIBLE BATTERIES                                                          

🔋 Alkaline Dry Batteries(1.5V & 9V):  AAAA   AAA  AA  C  SC  D 6LR61

🔋 Alkaline Button Cells (1.5V)

LR621(AG1)  LR726(AG2)  LR41(AG3)  LR626(AG4)  LR754(AG5)  

LR921(AG6)  LR927(AG7)  LR1120(AG8)  LR936(AG9)  LR1130(AG10) LR721(AG11)  LR43(AG12)  LR44(AG13) 

🔋  Lithium Button Cells(3V): CR1025  CR1216  CR1220  CR1616  CR1620  CR2016  CR2025  CR2032 CR2320  CR2430  CR2450           

🔋  Ni-MH/Cd (1.2V & 9V): AAAA  AAA  AA, A  C  SC  D  6F22

IV. LED DISPLAY & STATUS SYSTEM