Features:1. The digital LCD screen provides clear digital readings. 2. Intermittent treatment up to 100 amps and continuous operation at 50 amps. 3. Connect load to battery to provide real-time battery charge readings. 4. Process 0 to 60 volts. Suitable for 12, 24, 36 and 48 volt battery pack systems. 5. Very low power consumption is 7 mA. More efficient than any other instrument. 6. Measure energy (wh), charge (ah), power (w), current (A) and voltage (V). 7. Accurate and accurate 0.01 A current and 0.01 V voltage resolution. 8. Measure max current, max power (except Wattson) and voltage minimum (sagging). 9. Rugged - Handles 50A continuous and 100 A max at 60V. 10. Precision Alu-Chrom current sense resistor with a resistance of only 0.001 ohms and circuit consumes only 7 mA. 11. Use to increase ADC resolution and differential measurement amplifiers to improve noise immunity. Description: 1. Excellent complement to DC circuits, solar systems, boat / RV and battery backup systems. 2. Integrated meter, power meter, voltmeter, ampere hour meter, ammeter and electric energy meter. 3. A perfect troubleshooting tool. 4. Analysis, testing and troubleshooting of any DIY DC power supply project are indispensable. Specifications: Voltage: (0)V-4V-60V 0.01V (resolution) Current: 0-100 A max 0.01A (resolution) Power: 0-6554 W 0.1W (resolution) Charging: 0-65 Ah 0.001Ah (resolution) Energy: 0-6554 wh 0.1 Wh (resolution) Measurement update cycle: 400mS Signal sampling rate: sample / sec Data queue sequence time: 2 seconds Circuit resistance: 0.001 ohms Working current: 7 mA Colour:blue Material:Metal Package Contents: 3 x Watt Meter Only above package content, other products are not included. Note: Light reflection and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.