This RM409B is a handheld digital multimeter easy to use with high reliability and portability, a perfect tool for the laboratory,factory and home. It can measure AC/DC voltage, AC/DC current, resistance, capacitance, frequency, duty cycle, diode, continuity, NCV and temperature.Features:9999 counts with ture RMS and auto ranging, reliable and practical.Can measure voltage, current, resistance, capacitance, frequency, temperature, etc.Temperature testing,Celsius() and Fahrenheit() show simultaneously.With large LCD backlight display and data hold, convenient to read data in the dark.Small size and handheld, with a back bracket for supporting multimeter.Low power comsumption, powered by 2 * AA batteries.Automatically powers off after 5 minutes of inactivity to save energy.Widely used, perfect tool for the laboratory, factory and home.Specifications:Model Number: RM409BOperating Temperature: 0 - 40 Operating Humidity: 75%RHStorage Condition: -20~60Storage Humidity: 80%RHDIY Supplies: ElectricalOperating Mode: Auto/Manual RangingMeasuring Inductance Range: noMeasuring Temperature Range: -20~1000 C/-4F-1832F Measuring Capacitance Range: 9.99nF/99.99nF/999.9nF/9.99uF/99.99uF/999.9uF/9.999MFMeasuring Voltage Range: 999.9mV/9.999V/99.99V/999.9VMeasuring Current Range:999.9uA/99.99uA/999.9mA/10AMeasuring Resistance Range: 99.99/999.9/9.999k/99.99k/999.9K/9.999M/99.99M OhmFrequency: 99.99Hz/999.9Hz/9.999KHz/99.99KHz/999.9KHz/5MHzDuty Cycle: 1%-99%Sample Rate: 3 times per secondPower: 2 * 1.5V AA batteries(Not Included)Item size: 145 * 74 * 35mm / 5.71 * 2.91 * 1.38inPackage size: 185 * 115* 50mm / 7.28 * 4.53 * 1.97inItem weight: 168g / 5.93ouncesPackage weight: 330g / 11.64ouncesNote:Mearsurement must be made with correct input terminals and functions and within the allowable measuring range.Do not use the product around explosive gas, vapor, or in damp or wet environents.Low level of a battery will result in incorrect reading. Change the batteries when battery level is low. Do not make measurements when the battery door is not propely placed.Please allow 1-3" centimeter due to manual measurement.Batteries are needed before getting this multimeter work, which is NOT included in the package.Package List:1 * Digital Multimeter2 * Test Leads Pens1 * Temperature Test Cable 1 * User Manual