KISSfn
Fish Herder
Buy it if you want constant readings of NH3, pH, Temp and in the Reef version PAR, LUX and Kelvin light readings. I find I have to restart the software or reboot the unit at least a couple of times a day due to the software locking up. It will also cost you about $10 a month for replacement slides. If your pH is 6.4 or lower the red warning light will stay lit and you will get warning text messages and emails. This is supposed to be fixed in the future. It's good and hopefully will get better when newer software and added capabilities ( Nitrites, Nitrates, Chlorine, General and Carbonate Hardness ) are released.