Enhance your precision measurement tasks with this Programmable 4-Channel Voltage Calibration Module, designed for accurate multimeter calibration and reliable voltage reference. Crafted with high-quality PCB material and equipped with advanced charging management and protection features, this module ensures safe, stable, and efficient operation for both professionals and hobbyists. Key Features: · Programmable 4-Channel Voltage Calibration: Provides four commonly used, precisely calibrated output voltages of 10.0V, 7.50V, 5.00V, and 2.50V, suitable for a wide range of applications including multimeter calibration and instrument testing. · Built-In Charging Management and Protection: Features integrated loading and unloading protection systems to ensure safe and reliable usage, preventing damage during operation. · Multimeter Calibration Compatible: Specifically designed for calibration of high-precision multimeters, such as the HP3458A 8½ digit model, delivering up to 6½ digit accuracy with reliable and stable readings after proper warm-up. · Convenient Indicator Light System: Equipped with a clear indicator light; press and hold for 2 seconds to power on, illuminating all four indicators simultaneously for easy status monitoring. · Micro USB Charging Interface: Supports DC 5V power input via Micro USB for flexible charging and discharging, enhancing ease of use without the need for bulky adapters. · Multiple Output Interfaces: Features 2mm banana sockets and copper test sockets for effortless connection to multimeters and other measuring instruments. Specifications: · Item Type: Reference Voltage Calibration Board · Material: Printed Circuit Board (PCB) · Battery: Compatible with 1 x 3.7V 14250 special benchmark battery (battery not included) · Charging/Discharging Interface: Micro USB · Voltage Input: DC 5V · Output Interface: 2mm banana socket Package Includes: · 1 x Programmable 4-Channel Voltage Calibration Module This Reference Voltage Calibration Module combines precision, versatility, and safety into one compact and efficient unit, making it an indispensable tool for accurate voltage measurements and calibration in laboratories, workshops, and testing environments.