Comparing HM Digital AP-1, AP-2, TDS-3, EC-3 and COM-100 meter. I use different reverse osmosis liquids. Conversion factor is 2 µS (MicroSiemens) = 1 ppm. More info [ Ссылка ]
![](https://i.ytimg.com/vi/ax7GN24MQxc/maxresdefault.jpg)
Comparing HM Digital AP-1, AP-2, TDS-3, EC-3 and COM-100 meter. I use different reverse osmosis liquids. Conversion factor is 2 µS (MicroSiemens) = 1 ppm. More info [ Ссылка ]