Good thermometer for calibration and inkbird settings

[Fishko]

What are some good thermometers for calibration. Was thinking maybe the hanna ph so i get the ph and temp, or maybe buying the cheap 7 dollar one on amazon. The inkbird seemed to be pretty close to my cheap thermoter. Said my tank is at 80f and i have it set at 78. Thermoter also said 80. For the differential i set 1f is that fine? Was wonderig what the correct setting is

 

[dragon99]

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I've had good luck with Deltatrak thermometers. Cheap and reliable.

 

[Fishko]

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I've had good luck with Deltatrak thermometers. Cheap and reliable.

My sister gave me this laser thermometer and i just tried it out on my reef and it says around 78.9 while my inkbird is reading 79.9. Is it safe for me to calibrate maybe .5 degree to be more accurate

 

[X-37B]

Get a mercury lab thermometer from ebay.
Very accurate and good reference tool.

 

[Fishko]

Get a mercury lab thermometer from ebay.
Very accurate and good referance tool.

Like the long tube ones?

 

[X-37B]

Like the long tube ones?

Yes. Look up vintage lab thermometer.