Devices for sealing chemical totes and wirelessly monitoring chemicals in the totes include sensors for obtaining data from within the totes and transceivers for receiving and transmitting the data. The data is received from the sensor and transmitted to a gateway transceiver located at a remote location on a low-power wide-area network. Data can be aggregated from multiple devices and relayed to a server on the network. An integrated microcontroller is programmed with instructions for coordinating communications to and from the device transceiver. Systems can include multiple containers located up to 25 miles from one another using the device. Methods including wirelessly monitoring chemicals in chemical totes are disclosed. Data obtained using the device can be used in a variety of ways.