General usage: Easily measure battery voltage and capacity left Used for 1.2v,1.5v,3v,9v battery Widely use in Ni-H battery,NiCd,Zinc Carbon,rechargable batteries Battery fit:AAA,AA,C,D,Button cell,PP3 Features: 1)Reliable,Easy to use,Lightweight and compact. 2)LCD display gives an accurate and easy battery reading for both Voltage and Capacity 3)Measure Accurancy :0.5v; Resolution:0.1v; Voltage Test Range:0.2v-10.5v Power and storage: 1)Working Temperature and Humidity:0 degree-40 degree,75% 2)Storage Tempreture and Humidity:-10 degree-50 degree,85% 3)Operation Battery:2xAAA1.5v 4)Size:8.8*4.5*3.1cm(Without packing) 5)Weight:35g(Battery not included) Maintenance: Please be careful to avoid dropping and take out the battery if long time no use. Storage in cool and dry place.