1、It can amplify signals that are millivolts or even weaker, and the two potentiometers on the board rotate in counterclockwise to increase the multiple. 2、LM358 is the core two-stage operational amplifier, which can amplify DC weak signals, such as DC voltage signals and DC pulse signals. 3、There are two potentiometers for single-stage magnification adjustment of the first and second stages, respectively. 4、But the total magnification is the product of the multiple of these two, so the magnification will be adjusted to a large extent. 5、If the first level is adjusted to 20 times magnification, then if the second level is adjusted to 100 times, and the total magnification is 2000 times. Item Type: Voltage amplifier Supply Voltage: 3.5-24V DC power supply Current Output: Maximum 15-20MA (non-linear) Voltage Output: Output = input voltage signal x magnification Magnification: Total multiple = First multiple multiple x second multiple Board Size: Length: Approx. 45.3mm / 1.8in, Width: Approx. 16.2mm / 0.6 in 2 x Voltage Amplifier Module