Randy Holmes-Farley
Reef Chemist
View BadgesStaff member
Super Moderator
Excellence Award
Expert Contributor
Article Contributor
R2R Research
My Tank Thread
- Joined
- Sep 5, 2014
- Messages
- 67,421
- Reaction score
- 63,781
The only one that never needs to be calibrated….tropic Marin high precision hydrometer.
That isn’t true (my conductivity meter could not be calibrated), but the TM hydrometer is a fine device if you validate its accuracy at least once and make proper temperature corrections.