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TempPro

TempPro TP50 Digital Indoor Thermometer and Hygrometer

A basic battery-powered thermo-hygrometer (sold for years as the ThermoPro TP50) with an LCD showing high and low records, a comfort indicator and three ways to place it.

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TempPro TP50 thermometer and hygrometer units on a laboratory test-chamber tray beside a handheld reference instrument
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Photo: TempPro

Key facts

Humidity
10% to 99% RH; accuracy +/-2-3% RH (maker)
Temperature
-58 to 158 F (-50 to 70 C); accuracy +/-1 F (maker)
Refresh
Every 10 seconds
Display
LCD with high and low records and a Dry/Comfortable/Wet indicator; the maker's spec table says no backlight, although its product title says "backlit"
Calibration
User-calibratable, per the maker
Placement
Tabletop stand, magnetic back or hanging mount
Power
1 x AAA battery (included)

Which version should you buy?

This page covers: TP50, single unit (1-pack).

  • TP50, single unit

    This page

    Model: TP50

    What differs
    One temperature and humidity monitor. Pack size is the difference from the multipacks.
    Best for
    One room or location.
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  • TP50, 2-pack

    Model: TP50

    What differs
    Two TP50 monitors rather than one.
    Best for
    Two rooms or locations.

  • TP50, 3-pack

    Model: TP50

    What differs
    Three TP50 monitors rather than one.
    Best for
    Three rooms or locations.

Watch out

  • Check the pack count: single, two and three are quantities of TP50, not different sensor models.
  • The maker title says backlit, but its specifications say Backlight: No. Do not infer a separate backlit version from the title.
  • ThermoPro and TempPro branding can appear during the brand change; the maker warns that packaging may use its previous name.
  • TP50W and bundles with other model numbers are not established as equivalent TP50 packages.

Why people pick it

  • Humidity accuracy of +/-2-3% RH per the maker, enough to check a humidifier's effect
  • High and low records show overnight swings
  • Stand, magnet and hanging options

Know before you buy

  • No app or logging beyond the high/low records
  • No backlight per the maker's spec table, so it is hard to read in the dark
  • The comfort icon uses the maker's own bands, not EPA's 30-50% guidance

Full specifications

Humidity10% to 99% RH; accuracy +/-2-3% RH (maker)
Temperature-58 to 158 F (-50 to 70 C); accuracy +/-1 F (maker)
RefreshEvery 10 seconds
DisplayLCD with high and low records and a Dry/Comfortable/Wet indicator; the maker's spec table says no backlight, although its product title says "backlit"
CalibrationUser-calibratable, per the maker
PlacementTabletop stand, magnetic back or hanging mount
Power1 x AAA battery (included)
Dimensions3 1/8 x 2 5/8 x 1 in
Packs1, 2 or 3 units
Warranty1 year, extendable to 3 years by registering with the maker

From manufacturer documentation, checked November 2, 2026. Spotted an error? Tell us.

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Indoor Humidity Levels and the Best Hygrometers to Measure Them

What a hygrometer measures, EPA's 30 to 50% indoor humidity range, and four hygrometers and air monitors compared on stated accuracy, logging and placement.

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