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(w),current(A) and voltage(V). Accurate & precise 0.01 A cuurrent and 0.01 V voltage resolutions. Measures Amps, Watts(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 to increase ADC 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.