Measureing temp

[reefsluge]

I am having a heck of a time trying to figure out what my tanks temp is. I have two coralife digital meters, one lifeguard digital meter, one glass float thermometer, and the temp my chiller reads. Here's my problem.

coralife #1 says 74.1

coralife #2 says78.5

lifeguard says 79.4

glass float thermometer says about 77.8 or 9

chiller says 77.9

Now the chiller is adjustable which I have moved around. I don't know which device to believe in.

Has anyone run into this problem? Does anyone know a temp device that reads accrete?

Hobby Experience: 15 years
Current Tanks: 110g tank, 95% SPS, two 400w 14k's, 30g sump/refugium, euror reef skimmer, K2R reactor, JBJ 1/4 chiller, lots of love.
Interests: reefs/acros/muscle cars

[bertoni]

I bought a thermometer from Cole-Parmer that was calibrated and had guaranteed accuracy. That's one approach.

[Billybeau1]

I feel your pain.

This has dogged me for many years.

My Lifeguard read low for a couple of years, now it reads high.

The Coralifes I bought in the past frustrated me so much I thew them in the trash.

I currently still use my Lifeguard but have adjust the actual reading by 1.3 degrees (based on a good reference).

Believe it or not, I also have one of those that you peel and stick on the outside of the tank and it is pretty close all the time.

[reefsluge]

Originally posted by bertoni
I bought a thermometer from Cole-Parmer that was calibrated and had guaranteed accuracy. That's one approach.

I have never heard of Cole-Parmer thermometer. Is it digital, or a glass thermometer? Were did you buy it from?

[bertoni]

I just got a glass one from the Cole-Parmer web site. It was made by another company, I think.

[Bri Guy]

I would trust the glass one the most.

my coralife runs 2` low