Hanna salinity checker vs apex probe

E46er · 03/12/2021, 10:46 PM

So my new build just got salt a few days ago, my brand new Hanna salinity checker calibrated with the solution it came with is showing 1.024 and my apex probe also brand new was calibrated with the solution it came with.... it’s reading 38.1PPT ( 1.028)

The Hanna matches my refractometer
I will obviously have to buy some more calibration fluid and do both together but curious which way you guys would lean to being more accurate?

Vinny Kreyling · 03/13/2021, 09:36 AM

Word is the salinity probe has its problems.
A calibrated refractometer would be my choice.

E46er · 03/13/2021, 02:36 PM

i think the probe is out to lunch, I just recalibrated both with 35 PPT solution and they both read 35 PPT now an hour later the probe is back up to 39.8. the hanna checker and the refractometer match each other along with the solution as well.

well thats disappointing for a 2 week old unit

caliMako · 03/13/2021, 09:45 PM

Yea, the apex probe reads high on mine too. I would trust the hanna checker and use the apex probe to monitor large fluctuations in salinity, not accuracy. It is very finicky. And try to keep it away from areas with a lot of flow and micro bubbles. That helped for me as bubbles in the probe throw it off

Sent from my SM-G930V using Tapatalk

Spaced Cowboy · 03/13/2021, 10:08 PM

This might be of some use

Note the sensitivity to the temperature during calibration, and the advice to:

float the calibration packet in the water adjacent to the temp. probe for 15 minutes prior to calibration
Make sure the calibration solution packet remains in the aquarium water during the process

If you've done both of those, feel free to ignore this

03/12/2021, 10:46 PM	#1
E46er Registered Member Join Date: Feb 2009 Location: BC Posts: 136	Hanna salinity checker vs apex probe So my new build just got salt a few days ago, my brand new Hanna salinity checker calibrated with the solution it came with is showing 1.024 and my apex probe also brand new was calibrated with the solution it came with.... it’s reading 38.1PPT ( 1.028) The Hanna matches my refractometer I will obviously have to buy some more calibration fluid and do both together but curious which way you guys would lean to being more accurate? __________________ 250G DD LED SPS corner blow out RIP 300 G build in progress 80”x36”x24” 180G LED see thru

03/13/2021, 09:36 AM	#2
Vinny Kreyling Registered Member Join Date: Nov 2002 Location: Miller Place, NY Posts: 7,206	Word is the salinity probe has its problems. A calibrated refractometer would be my choice. __________________ 250 gallon mixed reef, 2 Reefbreeder's Photon V 2, Deepwater BLDC 12, DAS EX-3 Skimmer, MTC mini cal, 2-3/4" Sea Swirls, Aquacontroller & 6 Tunze pumps.

03/13/2021, 02:36 PM	#3
E46er Registered Member Join Date: Feb 2009 Location: BC Posts: 136	i think the probe is out to lunch, I just recalibrated both with 35 PPT solution and they both read 35 PPT now an hour later the probe is back up to 39.8. the hanna checker and the refractometer match each other along with the solution as well. well thats disappointing for a 2 week old unit __________________ 250G DD LED SPS corner blow out RIP 300 G build in progress 80”x36”x24” 180G LED see thru

03/13/2021, 10:08 PM	#5
Spaced Cowboy South Bay Reefer Join Date: Sep 2006 Location: San Jose, CA Posts: 395 Blog Entries: 29	This might be of some use Note the sensitivity to the temperature during calibration, and the advice to: float the calibration packet in the water adjacent to the temp. probe for 15 minutes prior to calibration Make sure the calibration solution packet remains in the aquarium water during the process If you've done both of those, feel free to ignore this

03/13/2021, 09:45 PM	#4
caliMako Registered Member Join Date: Jun 2002 Location: simi valley, ca Posts: 141	Yea, the apex probe reads high on mine too. I would trust the hanna checker and use the apex probe to monitor large fluctuations in salinity, not accuracy. It is very finicky. And try to keep it away from areas with a lot of flow and micro bubbles. That helped for me as bubbles in the probe throw it off Sent from my SM-G930V using Tapatalk