We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Handheld digital thermometer with backlit LCD display and probe

Cooper Atkins

Cooper Atkins TM99A NIST Digital Thermistor Thermometer measurement tool

SKU CH-4P38-HXWWM

A three-channel thermistor thermometer measuring -40 to 302 °F with ±0.3 °F accuracy and a NIST-traceable certificate

  • TypeEnvironmental & Mechanical
  • NIST-traceable calibration certificate included for verified accuracy
  • Measures -40 to 302 °F and -40 to 150 °C
  • Accuracy ±0.3 °F / ±0.2 °C or ±0.5 % of reading
  • Three independent thermistor channels for simultaneous monitoring
  • 1 ° resolution on backlit 4-digit LCD with min/max memory

Precision thermistor thermometer for multi-point

The Cooper Atkins TM99A provides three independent channels for simultaneous temperature tracking across separate locations. Its measurement range spans -40 to 302 degrees Fahrenheit, matching -40 to 150 degrees Celsius, which covers deep-freeze storage through high-heat processes. A NIST-traceable certificate is included, confirming calibration against national standards. The 0.1-degree resolution supports fine-grained logging in laboratory and industrial settings.

Stable accuracy during continuous operation

Accuracy is specified as +/- 0.3 degrees F or +/- 0.2 degrees C, or +/- 0.5 percent of reading, whichever is greater, and holds across the full range without drift qualifications. The four-digit backlit LCD presents live, minimum and maximum values for each channel without interrupting the sampling cycle. Two AAA cells power the unit for extended field sessions, and the min/max memory retains extremes even when the display is idle. No active cooling or warm-up period is required between readings.

Three-channel input decides fit for the job

The single specification that determines suitability is the three-channel thermistor input; applications needing only a single probe or a different sensor type will not use the extra capacity. Buyers who require thermocouple, RTD or infrared measurement should select a different instrument. The fixed 0.1-degree resolution cannot be adjusted for faster sampling or coarser logging. No data-logging output or computer interface is provided, so automated recording needs a separate solution.

Highlights

  • NIST-traceable calibration certificate included for verified accuracy
  • Measures -40 to 302 °F and -40 to 150 °C
  • Accuracy ±0.3 °F / ±0.2 °C or ±0.5 % of reading
  • Three independent thermistor channels for simultaneous monitoring
  • 1 ° resolution on backlit 4-digit LCD with min/max memory

Specifications

BrandCOOPER ATKINS
TypeEnvironmental & Mechanical

Questions about this item

How much power does the TM99A draw when it runs all day on its two AAA cells?

The TM99A operates on two AAA batteries and draws very little current, so a fresh set will last through extended daily use without needing frequent replacement.

What must I already own to start measuring with the TM99A right out of the box?

The thermometer ships ready to use; you only need to install the two included AAA batteries and attach compatible thermistor probes for the channels you want to monitor.

Will the TM99A agree with my older thermistor thermometer that also reads to 150 °C?

The TM99A covers the same -40 °C to 150 °C range and its stated accuracy is ±0.2 °C or ±0.5 % of reading, so readings should match closely within those tolerances.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.