There are simple meters for education and high precise meters for laboratory. Student meters are always with simple functions and ranges. MS series meter has a wide range for measuring the voltage, current and power of the circuit. It is suitable for both education and laboratory. It is also suitable for the industry as they are a portable meter. JL series meter is always using in electrotechnology measuring. We also have a digital multimeter, both portable and benchtop. Some portable digital multimeters can communicate with cell phones via Bluetooth. The user can install an application into the cell phone to save, recall and analyze the measurement result. Portable LCR meter, portable transistor tester, portable earth resistance tester and insulation resistance meter are also very useful for education. There are ac motor and dc motor, motor accessory and motor power supply in this category. And there are also machines and CNC machines.