yep the 802 is the one I have,, the probe needs stored in a bottle of storage solution when not in use, rinsed before useing and before returned to storage,
I believe it can be left in the nuit solution,,this will also cause the EC barbs to corrode
you will need a small 9 volt DC power supply,or the batt. will need replacing often
The cheap generic probe is only Ph not a combo,but the EC probe barbs can be cleaned many times

check out the tri-meter by nutridip,it has seperate probes for Ph/EC, and useing the $35 generic probe makes it cheaper to maintain