***could test all kinds of lamps ***Multiple functions, easy to operate. ***Compact size,easy to carry around Funtion: testing Life time. Power,Power factor,Current, Voltage,and Annual power consumption(calculated by 10hrs/day);Weight: 6.5kg. Diameter of ball: 50cmDiameter of opening hole: 10cm Maximum testing wattage: 300W. Input voltage: 100-250V AC. Testing lamps: energy saving lamps , tubes , ...