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Transparent handheld hygrometer thermometer psychrometer with LCD display

Yellow Jacket

Yellow Jacket 69008 HygroThermoPsychrometer

SKU CH-V42T-D0W4P

Measures humidity 0–100 % and temperature –4 °F to 122 °F with ±3 % RH and ±1 °F accuracy

  • Product colorTransparent
  • Measures humidity 0 to 100 % with ±3 % accuracy
  • Reads temperature -4 °F to 122 °F within ±1 °F
  • Calculates wet bulb down to -69 °F and dew point to -90.4 °F
  • Thermistor sensor delivers 0.1 % humidity resolution on LCD
  • Surface temperature range spans 4 °F to 140 °F

HVAC Diagnostics Tool

The Yellow Jacket 69008 HygroThermoPsychrometer measures temperature, relative humidity, wet bulb and dew point for HVAC technicians and facility managers who need a single handheld instrument for system diagnostics and indoor-air-quality checks. Its thermistor sensor and LCD display deliver simultaneous readings across psychrometric parameters.

Replaces Separate Meters

This unit combines the functions of a thermometer, hygrometer and psychrometer so technicians no longer carry three individual devices to capture dry-bulb, wet-bulb and dew-point data. The jump is worth it when service calls require rapid switching between temperature, humidity and calculated psychrometric values on one screen.

Sustained Field Use

The thermistor sensor maintains ±1 °F temperature accuracy and ±3 % relative humidity accuracy across the full operating span from -4 °F to 122 °F, while dew-point calculations remain stable from -90.4 °F to 122 °F during extended measurement sessions. The 0.1 % humidity resolution supports consistent trend logging without drift during long-running environmental assessments.

How it compares

Measured against everything we stock in Thermostats & Thermostat Accessories, at today’s prices. Recalculated every night.

Price $125.99
Pricier than about 71% of the 286 comparable items (median $78.49).

Specifications

Product
Brand nameYELLOW JACKET
Product colorTransparent

Questions about this item

What clearance does the Yellow Jacket 69008 need for its LCD display and thermistor sensor to read ambient air correctly?

The unit is a handheld psychrometer with an integrated LCD and exposed thermistor; allow a few centimetres of free air around the sensor so the 0.1 % humidity resolution and ±1 °F temperature accuracy are not affected by body heat or direct sunlight.

How do I start the Yellow Jacket 69008 for the first time, and what common step causes wrong dew-point readings?

Insert the required batteries, power on, and let the thermistor stabilise for several minutes before logging; skipping the warm-up period is the step that most often skews the -90.4 °F to 122 °F dew-point range.

When should I replace the sensor or recalibrate the Yellow Jacket 69008 to keep humidity accuracy within ±3 %?

The thermistor sensor is not user-replaceable; if readings drift beyond the stated ±3 % RH tolerance, return the instrument to a qualified calibration lab rather than attempting field adjustment.

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