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Following is a list of precision thermometers that may be used as a reference to calibrate sous vide equipment at the crucial 55°C/131°F without interpolating between ice-water and ovulation thermometer and boiling water.

Members are invited to add more thermometer models or correct specifications. Thermometers should first be presented and eventually discussed in the eG forums topic Reference thermometers and thermometer calibration methods for sous vide.

Minimal standards for a reference thermometer in sous vide could be: immersion probe with cable that can be placed adjacent to the PID controller's probe in the water bath; resolution 0.1° or better; accuracy ±0.25°C or better at 55°C; calibration certificate very desirable.

Model Company URL Price ca. USD Resolution Accuracy
@55°C
Probe type min/max function Comments presented in eG post
Traceable® 4000 Control Company http://www.control3.com/4000p.htm 380 0.001° ±0.05°C Type unknown, plugged cable, immersion Yes Calibration certificate incl.;
Data logging SW + USB cable $100
http://egullet.org/p1822675
GMH 3750 Greisinger Greisinger GMH 3750 455 0.01° ±0.03°C Pt100, plugged cable, immersion Yes Incl. 1/10DIN probe and 2-point-calibration 0°C/70°C;
with data logging capability
GMH 3710 Greisinger Greisinger GMH 3710 375 0.01° ±0.03°C Pt100, plugged cable, immersion Yes Incl. 1/10DIN probe and 2-point-calibration 0°C/70°C http://egullet.org/p1822395
GMH 2710 Greisinger Greisinger GMH 2710 153 0.1° ±0.2°C Pt1000, fixed cable, immersion Yes Available with heat resistant cable and handle (250°C) at $182
GMH 2710-K Greisinger Greisinger GMH 2710-K 182 0.1° ±0.2°C PT1000, fixed cable and immersion probe temperature resistant to 250°C Yes Also suitable to calibrate ovens
GTH 175/Pt Greisinger Greisinger GTH 175/Pt 77 0.1° ±0.25°C PT1000, fixed cable, immersion No Best price tag for ±0.25°C accuracy http://egullet.org/p1823341
GTH 175/Pt - K Greisinger Greisinger GTH 175/Pt - K 93 0.1° ±0.25°C PT1000, fixed cable and insertion probe temperature resistant to 250°C No Also suitable to calibrate ovens or core temperature measurement in an oven or in a BBQ grill/smoker. http://egullet.org/p1824012
GTH 175/Pt - WPT2 Greisinger Greisinger GTH 175/Pt - WPT2 158 0.1° ±0.1°C PT1000, fixed cable, immersion No Includes 2-point calibration 0°C/70°C. Best price tag for ±0.1°C accuracy http://egullet.org/p1824666
Thermapen ETI (distributed in the US by Thermoworks) ETI (UK)
Thermoworks (US)
95 0.1° ±0.4°C Fixed needle probe, no cable No Calibration certificate incl.;
not possible to calibrate water bath with lid on.
http://egullet.org/p1822880
Reference thermometer ETI http://thermometer.co.uk/919-reference-thermometer.html 370 0.01°C ±0.05°C fixed Pt100, cable No 5 point calibration certificate incl. (-18, 0, 40, 70 and 100°C) http://egullet.org/p1825235
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