Brand new and high quality. Digital LCD screen gives clear 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 . Extremely low power consumption of 7 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 Amps, (except for Wattson) and Voltage minimum(sag).Rugged- handles 50A continuous and 100 A at 60V. Acts like a wire so doesn't affect model's performance. Precision Alu-Chrom current sensing resistor, with only 0.001 Ohms resistance and circuitry that draws only 36 mA. USes DSP to increase resolution and differential measurement amplifiers to increase noise immunity. Voltage:(0)V-4V-60V 0.01V (Resolution). Current:0-100 A 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: 36 mA. Material:plastic colour:blue Package Contents: 1 x Watt Meter Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.Products from GuanGuan's store