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Ultra-High-Accuracy & Resolution Handheld Thermistor Thermometer - Discontinued


 | HH40

CAD530.00 HH41

1 year warranty
  • Works with Standard OMEGA ® “400” Series Thermistor Probes with Phone Jack Termination
  • Ultra-High Accuracy, up to ±0.015°C (±0.027°F)
  • Includes NIST Traceable Calibration Certificate
  • High Resolution, up to 0.01°F or °C
  • -20 to 130°C (-4 to 266°F) Temperature Range
  • Model HH42 has RS-232 Communications
  • Hold Function, Auto Shutoff, Rate of Change Arrow Indicators, Over/ Under Range and Low Battery Indication


The HH40 series has been discontinued. Please see the HH42A as a possible alternative or contact our Temperature Engineering department.

The Model HH41 handheld thermistor thermometer is a rugged, field tested unit that fits a wide variety of temperature measurement applications requiring ultra-high accuracy and high resolution at an economical price. The HH41 accepts OMEGA’s 400 Series thermistor probes with phone jack termination. The HH41 features display hold and °F/°C selection from the single front panel tactile feedback silicone function button. The unit’s LCD display features a low battery indication and also rate of temperature change arrows which, flashing at different speeds, inform the operator of the rate at which the temperature is changing. The unit has internal jumpers to disable selection of °F or °C from the front panel and enable display of either °F or °C only. Internal jumpers are also present to select either auto or manual shutoff mode.
In the auto shutoff mode, the unit will automatically shut off 10 minutes after the last function key entry. Model HH42 has all the features of the HH41 with the addition of RS-232 communications.
In situations where very high system accuracy is required, OMEGA offers a total system calibration service (probe plus meter); ask for CAL-4.


Instrument Accuracy* vs. Temperature
  Temp °C (°F)     Accuracy °C (°F)  
-20 (-4) ±0.016 (0.029)
-10 (14) ±0.015 (0.027)
0 (32) ±0.015 (0.027)
10 (50) ±0.015 (0.027)
20 (68) ±0.015 (0.027)
30 (86) ±0.015 (0.027)
40 (104) ±0.017 (0.031)
50 (122) ±0.019 (0.034)
60 (140) ±0.023 (0.041)
70 (158) ±0.029 (0.052)
80 (176) ±0.037 (0.067)
90 (194) ±0.049 (0.088)
100 (212) ±0.066 (0.119)
110 (230) ±0.088 (0.158)
120 (248) ±0.117 (0.211)
130 (266) ±0.156 (0.281)
*Ambient temperature: 18 to 28°C (64 to 82°F)

Temp Range°C (°F) Resolution°C (°F)
-20 to 102 (-4 to 215) 102 to 130(215 to 266)
0.01 (0.01) 0.02 (0.05)

Repeatability: 0.002 to 0.01°(C (-20 to 70°(C); 0.004 to 0.02°(C (-4 to 158°(F) typical for one week at constant ambient temperature
Temperature Range: -20 to 130°(C (-4 to 266°(F)
Reading Rate: 2 per second
Display: 412 digit LCD
Power: 9 Vdc battery, alkaline (included), optional 110 Vac or 220 Vac adaptor
Battery Life: 20 hr, typical, alkaline battery
Battery Indicator: Displays flashing battery indicator when less than 1 hour of battery life remains
Temperature Unit Selection: °(F/°(C selectable from front panel function button, or internal jumpers to enable °(F or °(C only
Shutoff Mode: Internal jumper selection for auto or manual shutoff mode; auto shutoff in 10 min with no function key entry
Thermistor Sensor: Works with OMEGAR 400 Series thermistor
(2252 ) probes with 14" phone jack
(Model PPM-2) connection
Operating Ambient: 10 to 40°(C (50 to 104°(F); 0 to 85% RH
RS-232 Communications: 9600 baud, no parity
Case Material: ABS Dimensions: 184.1 H x 83.8 W x 31.8 mm D (7.25 x 3.30 x 1.25")
Weight: 312 g (11 oz)
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What Other People Bought: When you see this icon, click on it to expand a list of products that other people have bought when they purchased this model.

Part Number/ Desc.
Click to expand/minimize a list of what others bought with theHH42
HH42 Star
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Handheld thermistor thermometer with RS-232 communications
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ON-403-PP Star
Availability: 2 weeks
Thermistor Probe
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Availability: In Stock
110 Vac adaptor for HH41 or HH42
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Availability: 1 week
220 Vac adaptor for HH41 or HH42
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Software for HH42
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Availability: 5 weeks
RS-232 cable for HH42
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Soft case for HH41 or HH42
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Rigid attache style case for HH41 or HH42 plus probes
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Extra alkaline battery
All dollar amounts on this site are shown in Canadian currency. Note: Each unit is supplied complete with 9 Vdc alkaline battery, NIST traceable calibration certificate and complete operator’s manual
Ordering Example: (1) HH40-AC AC Adaptor, CAD70.00  plus (1) HH41 Thermometer, CAD530.00, CAD70.00 + 530.00 = CAD600.00