Dieter Schmid's Fine Tools
Thermometer, hygrometer

Thermometer, hygrometer

Hygrometers provide a much more accurate measure of the humidity in your workshop than you can get by trying to estimate the humidity “by feel”. Hygrometers can provide warning of potential problems before they happen, such as rusty tools and excessive warping in wooden objects like workbenches or your latest fine furniture project. When you are planning a workshop, a hygrometer can give you important information about what will be needed to optimize the space and give notice that it might not be at all suitable. We offer combination instruments that additionally display temperature. Both physical quantities are important, as the amount of tolerable humidity depends on the temperature. More on this! In any case it is a vital piece of equipment for anyone interested in doing fine work.

Accuracy and tolerances: Spiral hygrometers have a metal spiral that expands or contracts as the humidity in the air changes, moving a hand on the gauge's face. Inside spiral hygrometer. These are the least expensive and least accurate instruments, and normally cannot be recalibrated. Hair hygrometers use the expansion and contraction of a hair, formerly a woman's hair, now an artificial filament or fibre, to measure humidity in a similar but more accurate way compared to the spiral hygrometers. The humidity is also shown by a hand on the gauge's face. Inside hair hygrometer. Hair hygrometers are more exact and more expensive, and can also be recalibrated. With humidities under 30 to 35 % both types of mechanical hygrometers encounter technical limits regarding accuracy. When it would be useful to have reliable readings under these limits, an electronic hygrometer is the only choice. They also provide more accurate readings over the entire humidity range than the mechanical types. Good electronic hygrometers measure capacitance, meaning that the humidity is measured through the changes in electrical characteristics of a condenser.

If you would simply like to be able to head off problems resulting from too much humidity in your workshop, or anywhere else for that matter, then the mechanical instruments will be more than adequate. But as so often is the case, better accuracy comes only at a higher price!

Shinwa thermometer and hygrometer set

These handy, easy-to-read instruments with a diameter of 48 mm represent a minor investment that will pay off for ever. It’s a simple way to monitor both room temperature and air humidity – indispensable in any workshop, office or home. The value range that is comfortable for people is marked on the thermometer by a red bar, on the hygrometer by a green bar. Both instruments can be hung on a nail in the wall or attached to any smooth, dry surface using the adhesive pads supplied. The housing is made of plastic, the dial of sheet metal, the pointer of aluminium.

Manufacturer’s specifications:
Measurement by metal spiral
Measurement range hygrometer 0 to 100 % humidity, + 2 graduation
Measurement accuracy humidity ±5 % RH (35...75 %)
Measurement accuracy humidity ±10 % RH (at other values)

Measurement range temperature -30 to +70 °C, + 2 graduation
Measurement accuracy temperature ±2 °C (-20 to +40 °C)
Measurement accuracy temperature ±4 °C (at other values)

Code 309637CartPrice € 8.90
Shinwa wall hygrometer – humidity/temperature gauge

The dial has a diameter of 150 mm (6 inches), and so is big enough not to be missed or ignored if it is placed as it should be: where your glance first falls when you enter the workshop. The hygrometer can give you a warning of increasing humidity and all the problems this can bring, like rusty tools and too much expansion and contraction in the joints of expensive workbenches and other furniture. The green strip indicates the comfort zone for humans. The small scale near the bottom indicates the temperature on the Celsius scale – itself a good thing to have in the workshop – when estimating open times for glues and resins, for instance. In any case, it is important to know both figures, as the level of tolerable humidity depends on the temperature. Plastic housing, for hanging on the wall, cannot be recalibrated!

Installation directions

Manufacturer’s specifications:
Measurement by metal spiral
Measurement range hygrometer 0 to 100 %
Measurement accuracy humidity ±10 % RH (under 35 %)
Measurement accuracy humidity ±5 % RH (35...75 %)
Measurement accuracy humidity ±10 % RH (over 75 %)

Measurement range temperature -30 to +50 °C
Measurement accuracy temperature ±4 °C (under -20 °C)
Measurement accuracy temperature ±1 °C (-20° to +40° C)
Measurement accuracy temperature ±4 °C (over +40° C)

Code 309635CartPrice € 21.50
Lufft climate meter

The Lufft climate meter also features a 150 mm face. It has a clean, classic design for fast, easy and accurate readings. Instead of the traditional human hair, it uses a Durotherm filament to measure humidity for more accurate and more stable results. The big dial shows the humidity, the smaller the temperature. The red hand on the dial can be turned by hand to set an upper warning limit, or to monitor changes over short periods. The Lufft climate meter can be calibrated using a screw located on the side of the plastic housing. A table stand is also available. Made in Germany.

Manufacturer’s specifications:
Measurement by Durotherm filament
Measurement range hygrometer 0 to 100 %
Measurement accuracy humidity ±3 % RH (35...95 %)
Measurement accuracy humidity at other values undefined

Measurement range temperature -10 to +50 °C
Measurement accuracy temperature ±1 °C (0° to +40° C)
Measurement accuracy temperature at other values undefined

Code 301700CartPrice € 95.00
Fischer thermo-hygrometer for temperature and humidity

This indoor hygrometer plus thermometer shows the optimal climatic values, depending on season and temperature, in a clear and easily understandable format. The coloured areas on the dial provide fast and accurate orientation on target values for a healthy indoor climate. The hygrometer utilizes synthetic fibres that are especially suitable for indoor conditions.

Manufacturer’s specifications:
Measurement range humidity 0 to 100 % RH
Measurement accuracy humidity ±3 % RH (20...100 %), + 1 graduation
Measurement range temperature 0 to 40 °C
Measurement accuracy temperature ±1 °C, + 1 graduation
Stainless steel housing, diameter 103 mm
Mounted on a square stainless steel backing plate 110 x 110 mm for wall mounting

Code 301705CartPrice € 55.00
Fischer thermo-hygrometer on base for temperature and humidity

This indoor hygrometer plus thermometer shows the optimal climatic values, depending on season and temperature, in a clear and easily understandable format. The coloured areas on the dial provide fast and accurate orientation on target values for a healthy indoor climate. The hygrometer utilizes synthetic fibres that are especially suitable for indoor conditions. Suitable as table-top or wall instrument. Removing the base provides an alternative wall mounting option to the square backing plate of the otherwise identical thermo-hygrometer above.

Manufacturer’s specifications:
Measurement range humidity 0 to 100 % RH
Measurement accuracy humidity ±3 % RH (20...100 %), + 1 graduation
Measurement range temperature 0 to 40 °C
Measurement accuracy temperature ±1 °C, + 1 graduation
Stainless steel housing, diameter 103 mm
Mounted on a stainless steel base, removable for wall mounting

Code 301706CartPrice € 77.00
Fischer hair hygrometer for outdoor applications

Hair hygrometers are the instruments of choice for outdoor measurements and high air humidity. The specially treated human hair of the Fischer hair hygrometer 111 is temperature resistant (temperature range -35 to +65 °C) and responds instantly to changes in humidity.

Manufacturer’s specifications:
Measurement range 0 to 100 % RH
Measurement accuracy ±3 % RH (20...100 %), + 1 graduation
Stainless steel housing, diameter 103 mm

Code 301707CartPrice € 52.00
Fischer thermometer

Bimetal thermometer

Manufacturer’s specifications:
Measurement range -35 to +55 °C
Measurement accuracy ±1 °C, + 1 graduation
Stainless steel housing, diameter 103 mm

Code 301708CartPrice € 25.00
Table stand for Lufft climate meter/strong> Picture with climate meter
Code 301703CartPrice € 15.00
Shinwa thermometer with sensor

This thermometer in a stainless steel housing has a 195 mm long sensor and a wide application range thanks to its large measurement range. You can use it to measure the temperature of liquids as well as the temperature of food in the oven. Large numerals make it easy to read. Click on the image to bring the sensor into view

Measurement range 0 - 200 °C
Housing diameter 80 mm
Sensor length 195 mm
Sensor diameter 8 mm
Total length 210 mm
Graduation 5 °C
Accuracy ±5 °C

Code 309636CartPrice € 29.95
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