A GSM gateway is a device for reducing the user's costs when calling from fixed lines to GSM networks. In general, calling from the fixed to a mobile network is more expensive than calling between mobile networks, but a GSM gateway allows you to save the difference
- 1sim 1 telephone port
- 2sim 2 telephone port
-32sim 8 telephone port
Here are samples of GSM Gateways:
A TDS Meter indicates the Total Dissolved Solids (TDS) of a solution, i.e. the concentration of dissolved solids in it. Since dissolved ionized solids such as salts and minerals increase the conductivity of a solution, a TDS meter measures the conductivity of the solution and estimates the TDS from that.
Dissolved organic solids such as sugar and microscopic solid particles such as colloids, do not significantly affect the conductivity of a solution so a TDS meter does not include them in its reading.
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