Abstract: Improvements in a power transformer condition monitor are disclosed with this application. The monitor operates with older existing transformers with and without integrated sensors and allows the device to determine the condition of transformers. The sensors monitor one or a multiple of voltage, current, temperature and or power factor. Thermal sensors are magnetically attached to the exterior of the power transformer. Voltage and current sensors are connected to the primary and secondary conductive wires. The monitor can be parasitically powered to operate with limited battery size. The only use of batteries or storage capacitors is when the supply voltage is lost. The monitor uses a localized board can have a large plurality of inputs for sensors. This allows multiple transformers to be locally connected to the monitor and thereby reduce the number of different communication devices and communication addresses over a Mesh, GPRS Cell network link network.