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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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