Product description: Professional RC Watt Meter is an excellent addition to your RC hobby, DC circuits, Solar system, Boat/RV & Battery Backup systems! This isn'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 DC power project. Features: The digital LCD screen shows clear crisp number readings. Connecting load end to the battery providing real?time battery charging reading. Digital LCD screen gives clear crisp number readings. The product has extremely low power consumption, which is more efficient than almost any LED meter. It acts like a wire so doesn't affect model's performance 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 36 mA. More efficient than any LED meter. Measure energy(wh),charge(ah), power(w),current(A) and voltage(V). Accurate & precise 0.01 A cuurrent and 0.01 V voltage resolutions. Measures peak Amps, peak Watts(except for Doc Wattson) and Voltage minimum(sag). Rugged- handles 50A continuous and 100 A peak at 60V. Acts like a wire so doesn't affect model's performance. Accuracy Alu-Chrom current sensing resistor, with only 0.001 Ohms resistance and circuitry that draws only 36 mA. Specifications: Color:Blue Voltage:(0)V-4V-60V 0.01V (Resolution). Current:0-100 A peak 0.01A (Resolution). Power:0-6554 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: Approx.36 mA. Size:8.3cm x 4.7cm x 2cm - 3.27inch x 1.85inch x 0.79inch Package Included: 1Pcs x Watt Meter