The Aqua Master P700 Pro 2 Combo Meter is designed for long-term, low maintenance use. Just plug in the AC adapter, calibrate and the unit is ready for continuous monitoring. A rechargeable battery is included, so even when there is no access to power the monitor will still function.
Plug the power supply into the wall outlet and connect the USB connector to the meter.
You can also use the meter continuously and keep the electrodes in the liquid to be measured. Then keep in mind that these need to be calibrated more often. It is also important to check for algae deposits and, if necessary, to carefully clean the electrodes.