Features: Accurate measurement of current, suitable for auditory power monitoring, to ensures safe and stable operates of equipment Pointer design, display of current values, convenient for monitoring the real-time current status of the equipment Model 45 100mA ammeter head, suitable for small power equipment, providing precise current monitoring function. Simple and easy to use, no need for additional power supply drive, directly use to the circuit for measurement Easy installs, suitable for applications where space is limited Accurate and responsive values Specifications: Size:about 47x47mm/1.85x1.85in Component:ABS Current:100mA Type:45 Type Ammeter Note: Due to problem of lighting,there might be tolerances in product, please understand. Please allow 0-1cm error due to the measurement Package includes: 1PC 100mA Type Amplifier Ammeter