I would check that model because he is right a ppm reading of only 999 is not enough to finish flower.
Zandor Reviewed by Zandor on . Will this work for tds/ppm???? Hey I say this on Ebay and was wondering if it would be perfect for DWC? http://cgi.ebay.com/HANNA-TDS-PPM-Handheld-Tester-Meter-Like-New-in-Box-NR_W0QQitemZ120027020138QQihZ002QQcategoryZ117435QQssPageNameZWDVWQQrdZ1QQcmdZViewItem Rating: 5