TEST PRODUCTS INTERNATIONAL 343C2 Thermometer Thermocouple 1.875 in LCD NIST Certificate

Single-Channel Thermocouple Thermometer

The TEST PRODUCTS INTERNATIONAL 343C2 is a handheld thermocouple thermometer with a 1.875 in LCD display. It measures temperatures from -58 to 2,462 Degrees F using a single input channel. The unit includes a NIST-traceable calibration certificate for documented accuracy. It is suited for technicians who need verified readings in HVAC, industrial or laboratory settings.

Upgrade from Uncertified Probes

This model replaces basic thermometers that lack traceable calibration or that only cover a narrower range. The jump is worth it when work instructions or quality systems require proof of accuracy across both sub-zero and high-heat conditions. The stated tolerances are +/- 0.3 Percent + 1.8 Degrees F from 32 to 600 Degrees C and +/- 0.4 Percent + 1.8 Degrees F from 600 to 1,350 Degrees C. Buyers who need dual-channel logging or wireless data transfer will not find those features here.

Simple Bench Setup

Power comes from a single 9 V battery, so there is no mains lead to route. Connect the thermocouple plug, select the scale and the reading appears on the LCD. The most common issue is using a mismatched thermocouple type, which shifts the reading outside the published tolerance. Ensure the probe matches the instrument calibration before trusting critical measurements.