Item Type: Voltage Reference Module_x000D_ Input Voltage: 12V-24V_x000D_ Working Temperature: -25~85_x000D_ Working Humidity: 5%~95%RH_x000D_ 4 Channel Output Voltage: 2.5V, 5.0V, 7.5V, 10.0V_x000D_ Reference Voltage Value: AD584JH, 5% error_x000D_ Reference Resistance Value: Precise resistance 100 1K, 10K, 100K, 1% error, the measured value is normal within the error range_x000D_ Application: For calibrating multimeters_x000D_ Applicable Battery: 12V 23A_x000D_ Size: Approx. 8 x 5cm / 3.1 x 2.0in 1EASY TO CONNECT: The reference module uses original copper terminals, which is convenient for the multimeter pen to be inserted directly. 2HIGH ACCURACY: The reference voltage value uses AD584JH, with 5% error, the resistance value adopts resistor 100 1K, 10K, 100K, with 1% error. 34 CHANNEL DESIGN: The voltage reference module has 4 channel output voltages of 2.5V, 5.0V, 7.5V, 10.0V, and built in resistance reference source. 4COMPACT SIZE: The reference source module is small in size and light in weight, easy to carry and store, and has strong practicability. 5DURABLE MATERIAL: Made of excellent materials, strong and durable, has long service life, and widely used in multimeter calibration.1 x Voltage Reference Module 4 x Screws 4 x Nuts