To demonstrate the removal of heat during evaporation.

If you place a cup of water filled to the brim in front of a duck that is movably suspended in a frame and moisten its head, the duck will tilt its head into the glass.

As long as it can dip its beak in and moisten it, it will “drink”.

With hanging loop, d=100mm

• Outside temperature and humidity via transmitter
• Room climate with indoor temperature and humidity
• Weather forecast with symbols, air pressure history
• Programmable alarm conditions, storm warning
• Radio clock with alarm and date, backlit display

Measuring time: 0.5 sec., display of the current temperature, maximum and minimum temperature during the measurement, hold and lock function, measuring range: -33...+220 °C, switchable °C/°F, accuracy ± 1.5 °C from 0 ... 50°C, otherwise ± 2.0°C or 2%, including battery CR 2032 button cell 68 x 37 x 18 mm, 75 g

Measuring range -50…+500°C (-58 °F…+932 °F)

Material: Plastic

Power consumption: Batteries

Batteries included

Batteries: 2 x AAA 1.5 V

Dimensions: (L) 39 x (B) 110 x (H) 144 mm

Weight: 144 g

High quality red light diode laser pointer. 

Powered by 2xAAA batteries.

dimensions: 138 x 18mm

weight: 24g

Suitable to replace a standard E10 screw-base flashlight bulb. Introduce students to Light Emitting Diode (LED) technology and its uses in addition to incandescent bulbs. Voltage 2.5...6V, max power 0.12W. Dimensions: Ø11 x 28mm

The optical system consists of three lenses in a metal housing.

In a plastic box.

Wooden leaf and plant press for making herbarium.

Set includes 2 wooden panels and 6 cardboard plates. Dimensions 17 x 17 cm.

• For pool and pond
• Water temperature with highest and lowest values
• Display of indoor temperature and humidity
• Adjustable temperature alert
• Pool transmitter with 180 mm measuring depth and solar cells
• Radio-controlled clock with alarm and date
• Expandable by up to 7 temperature/humidity transmitters (optional)

Function

• Outdoor temperature and humidity, wind speed, wind direction and rainfall via three wireless outdoor transmitters (433 MHz) with ranges of up to 100 m (free field)
• Indoor temperature and humidity
• Trend arrows, maximum and minimum values with time and date of storage
• Adjustable alarm settings for temperature, humidity, rain and wind
• Weather forecast with symbols and air pressure tendency
• Relative air pressure and graphic chart of the air pressure trend of the last 24 hours
• Graphic display of wind direction (LCD wind rose) and display of prevailing wind direction, optionally as compass direction or degree number
• Display of current, average or highest wind speed
• Maximum wind speed of the last 24 hours, 7 days, the current month and year can be called up with time and date of storage
• Windchill temperature
• Rainfall today with graphical representation
• Display of rainfall of the last hour, the last 24 hours, the last 7 days, the current month, the current year and in total
• Monthly history function of rainfall for the last 12 months
• Radio-controlled clock with complete date and weekday (8 languages)
• Solar-supported windmeter
• Optional: Expandable to up to 3 thermo-hygro transmitters (sold separately)