MG Power (MG-6S-TESTER) 2-6 CELLS LED Display Battery Voltage Indicator / Checker / Tester Features: Checking the voltage of each battery A useful tool for outdoor/ indoor flight User-friendly display Lightweight tool No battery required Specification: Dimension: 50*19.05*9mm For 2-6 cells LiPo battery / Lithium battery Input: 0.01V-4.50V per cell Precision: +/- 0.02V Weight: 2g