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Dew point and wet bulb live on screen — and no published accuracy

Reed 8706

A digital psychrometer displaying humidity, temperature and dew point or wet bulb together, with Max/Min/Avg and data hold.

Reed 8706 digital psychrometer and thermo-hygrometer with dual-line LCD

Reed 8706

A digital psychrometer displaying humidity, temperature and dew point or wet bulb together, with Max/Min/Avg and data hold.

Displays
%RH, temperature and dew point or wet bulb, simultaneously
Readings
Max, Min and Average
Data hold
Yes
External probe
Optional 87P6, for contact and differential temperature
Units
User-selectable °F / °C
Power
Batteries; low-battery indicator and auto shut-off
Stated uses
Environmental studies, food distribution, HVAC/R installation, greenhouses, industrial spaces, saunas, humidors, museums, lab monitoring
Accuracy
Not stated by the maker
Range
Not stated by the maker
Amazon reference
B0C6BJ612L
EAN
0800837000057
  • Shows humidity, temperature and dew point or wet bulb on screen at the same time — the only instrument on this shelf that does
  • An optional external probe for contact and differential temperature, which no other device here offers
  • No accuracy and no measurement range published anywhere in the listing

Best for: HVAC work, a humidor, a museum case or a greenhouse, where dew point matters and the reading has to be recorded by hand

≈ $125
Check price on Amazon

Specifications

Displays
%RH, temperature and dew point or wet bulb, simultaneously
Readings
Max, Min and Average
Data hold
Yes
External probe
Optional 87P6, for contact and differential temperature
Units
User-selectable °F / °C
Power
Batteries; low-battery indicator and auto shut-off
Stated uses
Environmental studies, food distribution, HVAC/R installation, greenhouses, industrial spaces, saunas, humidors, museums, lab monitoring
Accuracy
Not stated by the maker
Range
Not stated by the maker
Amazon reference
B0C6BJ612L
EAN
0800837000057

What the maker puts in writing

  • %RH, temperature and dew point or wet bulb, simultaneously
  • Max / Min / Average · data hold
  • Optional 87P6 external probe for contact and differential temperature
  • °F / °C selectable · low-battery indicator · auto shut-off

Dew point is the reason to buy it

A hygrometer tells you how much water is in the air. Dew point tells you at what temperature that water will condense — on a window, in a wall, inside a humidor.

Of the nine devices on this shelf, two publish dew point and this is the one that shows it live alongside the humidity and the temperature.

And accuracy is the reason to ask first

Nine bullets, and the nine include saunas, museums and food distribution. None of them includes a tolerance.

That is the pattern across this whole shelf: the four devices that state how accurate they are all cost under twenty-two dollars, and both professional instruments here state nothing.

Availability

Read on the day this page was built: $125 at the American Amazon shop.

Read from Keepa on the day this page was last revised; stock and price both move without notice.

Prices quoted in this text were read on 2026-10-04. The live price is at the top of the page.

The questions that keep coming up

What is wet bulb for?

It is the temperature air reaches when cooled by evaporation, and it is the figure HVAC calculations use. Dew point tells you when condensation will form. This is the only instrument on this shelf that shows either, and it shows both.

How accurate is it?

The listing does not say. On a psychrometer sold for lab monitoring and museum work, that is the figure the buyer needs, and it is absent. Four household devices on this shelf publish tolerances; this one does not.

Is it better than the cheap hygrometers here?

For dew point, Max/Min/Avg and a probe, yes — no household device here does any of it. For knowing how close the humidity reading is, no: a seven-dollar DOQAUS on this shelf publishes ±5% RH and this publishes nothing.

More thermo-hygrometers

  • TempPro TempAir digital hygrometer and indoor thermometer with wide LCD display

    TempPro TP53

    A digital hygrometer accurate to ±2 °F with all-time and 24-hour high and low records and a touch-activated backlight.

    Temperature accuracy
    ±2.0 °F (±1.1 °C)
    Humidity accuracy
    ±2 to 3% RH
    Refresh
    Every 10 seconds
    Records
    All-time and 24-hour high and low, stored and displayed
    Comfort indicator
    Yes
    Backlight
    Touch-activated, via a button below the display
    Mounting
    Holder, hanging hole and magnetic back
    Range
    Not stated by the maker
    Logging
    High and low only — no curve or export
    Amazon reference
    B079N98K93
    EAN
    6971604200285
    • The only device on this shelf that keeps high and low records — both 24-hour and all-time — without needing an app
    • Publishes both tolerances, with the humidity figure tighter than two cheaper devices here
    • A ten-second refresh, the slowest of the three published on this shelf

    Best for: A nursery, cellar or greenhouse where the overnight low matters more than the live reading

    ≈ $16
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  • TFA Dostmann analog thermometer and hygrometer with metal ring bezel

    TFA 45.2024

    A German-made analog thermo-hygrometer with a metal ring, publishing the optimal indoor ranges it is read against.

    Type
    Analog — no batteries
    Case
    Metal ring
    Origin
    Completely made in Germany
    Comfort zones
    Marked on the dial
    Stated targets
    Optimal temperature 18–22 °C (64 to 72 °F); optimum humidity 40–60%
    Mounting
    For hanging, indoors only — house, basement or garage
    Temperature accuracy
    Not stated by the maker
    Humidity accuracy
    Not stated by the maker
    Amazon reference
    B0044XII3A
    EAN
    4009816020284
    • The only listing on this shelf that publishes the target ranges — 18 to 22 °C (64 to 72 °F) and 40 to 60% RH — so the reading means something without looking it up
    • A metal ring rather than a plastic bezel, and German manufacture, both stated
    • No accuracy figure for either measurement

    Best for: A hallway or a cellar wall, for someone who wants the comfort band marked rather than calculated

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  • TFA Dostmann analog thermo-hygrometer, slim upright case with twin dials

    TFA 45.2043.51

    A German-made analog thermo-hygrometer with a synthetic-hair hygrometer and marked comfort zones.

    Type
    Analog — no batteries
    Hygrometer element
    Synthetic-hair precision hygrometer
    Origin
    Entirely manufactured in Germany
    Comfort zones
    Marked: dry, ideal, wet
    Mounting
    Wall mounted or freestanding
    Use
    Indoor only — house, basement or garage
    Temperature accuracy
    Not stated by the maker
    Humidity accuracy
    Not stated by the maker
    Range
    Not stated by the maker
    Amazon reference
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    EAN
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    • The only instrument on this shelf whose sensing element is named: a synthetic-hair hygrometer, which lengthens with humidity and needs no power
    • Made entirely in Germany, stated, which no other listing on this shelf claims for any country
    • A bullet headed "Precision" that gives no figure — and five of the nine devices on this shelf are in the same position

    Best for: A room where an instrument should last decades without a battery and look like an instrument

    ≈ $40
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Elsewhere in the spares drawer

  • ChiliTec ST35 plug-in outlet thermostat with analog rotary dial

    ChiliTec ST35

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    Max. load
    230 V, 16 A, max. 3,500 W — stated by ChiliTec
    Temperature range
    +5 °C (41 °F) to +30 °C (86 °F), adjustable in 1 °C steps
    Switching behavior
    ±1 °C (34 °F) threshold, 10-second measurement interval, with a delayed reading ChiliTec says is meant to stop the relay tripping on a passing draft
    Mode switch
    Slide switch between heating and cooling; the connected device is driven in whichever mode is selected
    Sensor
    Internal — reads the air at the plug, not a remote probe
    Protection rating
    IP20, indoor use only
    Dimensions / weight
    H 128 × W 68 × D 39 mm (5.04 × 2.68 × 1.54 in) as plugged in; 190 g
    Amazon reference
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    • 3,500 W / 16 A rating is published by name, not left to be inferred from the plug
    • A heating/cooling slide switch means the same unit can drive a fan or a cooling device, not only a heater
    • Internal sensor only — it reads the air right at the socket, which runs warmer than the middle of the room once a heater has been on for a while

    Best for: Adding a numeric-ish setpoint to a heater or fan that only has a low/medium/high dial, in a dry room where the socket sits close to where you actually want the temperature held.

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  • Aygrochy black 150 mm flexible exhaust hose with two stainless-steel hose clamps

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    Diameter
    153 mm (6.02 in), per Aygrochy
    Length
    Up to 3 m (10 ft)
    Material
    PVC membrane, steel wire and a double layer of aluminum foil
    Temperature range
    -30 °C (-22 °F) to +100 °C (212 °F), stated to pass the GB8624 B1 combustion test
    Included hardware
    2 stainless-steel hose clamps
    Color
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    Amazon reference
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    • Confirmed with a valid New-condition price on all four European markets checked (DE, FR, IT, ES), each with 2 active seller offers at the time of checking
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    • No declared compatibility with any specific appliance model — it is sold by diameter (153 mm (6.02 in)), not by machine

    Best for: A short universal 150 mm (5.91 in) hose run, for a buyer who wants a stated fire-test result and doesn't need more than 3 m (10 ft) of reach.

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  • CREATCABIN fabric dust cover for tower and pedestal fans

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    Dimensions
    125cm (49.2 in) tall x 60cm (23.6 in) wide, per the listing
    Fit type
    Generic / universal — not model-specific
    Material
    Fabric, stated dust-resistant
    • Cheap, and confirmed with a live offer on Amazon.de
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All thermo-hygrometers