BATTERY INDICATOR & HOUR M TER ,RL-BI004 Operating Range: Hour meter-DC9V~80V Battery meter:12V,24V,36V,48VDisplay:Battery state-of-charge: 10-bar, tri-color Hour meter: 6-digit, 5mm highResolution—Hour meter: 99,999.9 hoursTemperature—Operating:-40°C to 85°C Storage: -50°C to 90°CHumidity—maximum 95% RH(Non condensing) at 38°CMechanical Shock—SAE J 1378, 55gMechanical Vibration—SAE J 1378, ...