Reliable measure of temp in SPS tank

[scyphozoa]

What type/brand of thermometer do you use on your SPS tank? (My thermometer and I are having some trust issues in our relationship lately)

 

[jsweir]

Ranco dual temperature controller

 

[Ti]

99cents mercury thermometer

 

[clkwrk]

2 aquacontrollers
2 rancos
3 coralife
3 glass ones
JBJ digi meter
won bro heater with temp readout

and none match another not even the same brands.

Finally I got some ice crushed it and added very little water then I calibrated my aquacontroller.

 

[nemofish2217]

coralife.... 2 of them

 

[palawan]

$1.20 mercury themometer bought at petco. My reference temperature device. Those electronics ones by lifegard can have issues. Just like those plastic hydrometers.