Product description: for DC circuits, Solar system, Boat/RV & Battery Backup systems! This isn'for t just a watt meter-it's the All-In-One Meter! A power meter, a volt meter, an amp-hour meter, ammeter and energy meter. Everything all in one unit! This is the perfect troubleshooting tool. This all-in-one watt meter is indispensable for analyzing, testing and troubleshooting any DIY for DC power project. Features: Brand new and high quality. Digital LCD screen gives clear crisp number readings. Handles up to 100 amps intermittently and 50 amps continuous duty. Connecting load end to the battery provides real-time battery charging reading. Handles 0 to 60 volts. Works on 12, 24, 36, and 48 volt battery bank systems. Extremely low power consumption of 7 mA. More efficient than any LED meter. Measure energy(wh),charge(ah), power(for w),current(A) and voltage(V). Accurate & precise 0.01 A cuurrent and 0.01 V voltage resolutions. Measures for peak Amps, for peak Watts(except for Doc Wattson) and Voltage minimum(sag). Rugged- handles 50A continuous and 100 A for peak at 60V. Acts like a wire so doesn'for t affect model's performance. Precision Alu-Chrom current sensing resistor, with only 0.001 Ohms resistance and circuitry that draws only 7 mA. USes DSP to increase ADC resolution and differential measurement amplifiers to increase noise immunity. Specifications: Color:Blue Voltage:(0)V-4V-60V 0.01V (Resolution). Current:0-100 A for peak 0.01A (Resolution). Power:0-6554 for W 0.1W (Resolution). Charge:0-65 Ah 0.001Ah (Resolution). Energy:0-6554 wh 0.1 Wh (Resolution). Measurement Update period:400mS. Signal Sampling Rate:sample/s. Data Queue Sequence time: 2 seconds. In Circuit Resistance:0.001 Ohms. Operation Current: 7 mA. Size:8.3cm x 4.7cm x 2cm - 3.27inch x 1.85inch x 0.79inch Package Included: 1 x Watt Meter 1 x User Manual