I'm slowly going through some of the things I don't need anymore and as I do I'll post them up here for sale
To start with:
Apogee SQ-520 LED PAR sensor. Requires laptop or something to run as a readout and run software. Works great and recently recalibrated by Apogee. $375
Hanna Alkalinity checker with 3 bottles of reagents and 3 and a half bottles of reagents that expired in February that are still reading good tests results $45
Hanna Calcium checker $40
Both rarely used