Hanna Instruments

HI98509 Checktemp 1 Digital Thermometer

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Knowing the temperature of your reef tank is very important, and with the Hanna Checktemp HI98509 Digital Thermometer, you can accurately know your aquariums temperature within 0.5°F. Each Checktemp comes with a 3.3' silicone cable that has a stainless steel probe at the end that gives rapid readings and will maintain its performance over a long time. Using an NTC thermistor sensor, the Checktemp has multiple different uses for measuring liquids, air, and even semi-solid products. The monitor has a large LCD display and with CALcheck the system will go through a self-check every time the system starts up it will give you a visual report if something is wrong within a couple seconds.  

  • IP65 water resistant
  • Displays in °F or °C
  • CAL Check
  • ±0.5°F accuracy
  • Silicone probe cable
  • Large display
  • AISI 316 stainless steel probe
  • User selectable auto-off


Hanna's Checktemp comes with a certification that validates the production of the unit, calibration and other testing required to meet all of Hanna's requirements, using standards and reference instruments that are traceable to the National Institute of Standards (NIST) in the USA or to the internationally acceptable national physical standards. The standards and reference instruments used in calibration and tested are also supported by a calibration system which meets requirements of ISO9001. Every Checktemp includes a certificate on the back of the manual. The certification lists tests at various reference points and any deviations from those points. These tests are then signed and dated by an engineer in the manufacturing plant.



Range: -58.0 - 302.0°F

Resolution: 0.1°F

Accuracy: ±0.5°F

Probe: Stainless steel

Probe Cable: Silicone 3.3'

Power Supply: 3x AAA batteries (included)

Battery Life: Approximately 3 years of use

Auto-Off: 8 min, 60 min, or disabled

Dimensions: 4.2" x 2.3" x 0.65"


What's Included?

1x HI98509 Checktemp Thermometer

1x Monitor Stand

1x 3.3' Probe & Cable

3x AAA Batteries


pdf HI98509 Owners Manual

More Information
Dimensions 4.2"L x 2.3"W x 0.65"H
WiFi No
Temperature Range -58.0°F - 302.0°F
Additional Notes IP65 water resistant
Operates with 3x AAA batteries (included)
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Product Questions

Does this HI98509 CHECKTEMP 1 DIGITAL THERMOMETER have an one off switch or does it stay on all the time once the batteries are in?
Question by: Robert Rainey on Mar 1, 2018, 1:49 AM
Hi there,
Thank you for reaching out.
The HI98509 has an on off button on the back of the unit that controls the power.
Please let us know if you have any other questions.
Have a great day!
Answer by: William Glenn on Mar 6, 2018, 12:21 PM