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 1/4 Scale SPOOKY WITCH MAGIC MUSHROOM FAIRY HOUSE TEAPOT MINIATURE OOAK J.Dunn US $7.89 
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 Dolls house miniature WITCH WIZARD FILLED SHELVES US $34.69
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 Dolls house miniature FILLED CHEMIST / APOTHECARY / WITCH OR POISONER WOT-NOT US $39.43
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 Dolls house miniature WITCH WIZARD FILLED TRUNK US $25.28
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 OOAK "AMETHYST" PUMPKIN STACK WITCH WIZARD MINIATURES MARIES MAGICAL MINIATURES US $1.56
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 Dolls house Artisan handmade miniature doll " " Witch / Hag US $134.33
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 Dolls house Miniature WITCH TABLE with Hat by Kat the Hat Lady! US $56.89
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 OOAK OLD TALLOW CANDLES WITCH AND WIZARD MINIATURES MARIES MAGICAL MINIATURES US $1.56
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 OOAK "GOLD DUST" SPELL SUPPLIES CRATE WITCH MINIATURES MARIES MAGICAL MINIATURES US $1.56
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 Dollhouse Miniature Halloween Flying Witch Figurine US $4.99
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 Dollhouse Miniature Witch WICCA Pagan gothic house US $99.99
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 Dollhouse Miniatures ~ Halloween or Haunted Corner Cabinet w/ Bones for a Witch US $29.95
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 Dollhouse Miniatures ~ Halloween / Haunted Witch Skeleton in Black Cape & Hat US $28.00
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 Dollhouse Miniatures Halloween Haunted Green Witch Skeleton w/ Black Cape & Hat US $28.00
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 Dollhouse Miniatures ~ Halloween / Haunted Witch Skeleton in Black Cape & Hat #1 US $28.00
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 Miniature Halloween Bag - Witch Stirring a Cauldron US $2.00
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 Miniature Halloween Bag - Witch Riding a Broom with a Black Cat US $2.00
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 Miniature Halloween Bag - Witch and Black Cat on Jack-o-Lantern US $2.00
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 Miniature Gift Bag - Happy Halloween Witch Flying Past the Moon US $1.85
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 Miniature Dollhouse Witch Wizard Dragon Bird US $9.99
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 Dollhouse Miniature Witch Crystal Ball Tarot Card NR 1:12 US $5.49
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 Dollhouse Miniature Set of 5 Witch Reference Books with Blank Pages US $11.95
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 Dollhouse Miniature Halloween Goth Witch Wizard Medical Doctor Skull with Candle US $11.99
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 Artist MINIATURE Halloween Witches' HAT ONLY OOAK by BDH US $15.99
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 Dollhouse Miniatures ~ Halloween ~ Witch's Shelf or Cupboard Filled Up w/ Hat US $45.00
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 Dollhouse Miniature Halloween Witch, wizard, H Potter, Alien Pumpkin, Barfing US $7.99
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 1/4 scale Miniature - WITCH, WIZARD OR FAIRY - FACE PUMPKIN - OOAK C. Rohal US $9.99
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 OOAK Miniature Spooky Scary Halloween Fairy Witch By O'Dare US $6.00
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 Halloween Miniature Cat, Broom & Handmade Witch Hat--OOAK--Artist--Gothic-Cute US $9.99
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 Miniature Hand Painted Pumpkin w/Hand Made Felt Witch Hat-OOAK-Artist-MINI3 5/8" US $9.99
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 dollhouse miniature Quirky Witch on Broom - Silvery Metal Wall Plaque US $8.99
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 Dollhouse Miniature Halloween Goth Witch Wizard Potter Candelabra with 3 Candle US $99.99
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 Dollhouse Miniature Halloween Goth Witch Wizard Potter Candelabra with 5 Candle US $249.99
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 Dollhouse Miniature Halloween Purple Witch Cape, Hat US $34.95
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 Dollhouse Miniature WITCHES ALMANAC non-opening Book US $2.99
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 1:12 Scale Resin Sitting Witch Dolls House Miniature Garden Accessory US $2.53
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 Dollhouse Miniature OOAK Halloween Decor- Witch's Hat US $5.99
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 Miniature Book Izzy the Witches Brew US $15.00
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 Dollhouse Miniature Halloween Witch Kitchen Hutch SHIPS FREE US $26.99
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 Dollhouse Miniature Halloween Witch Cabinet Filled 1:12 SHIPS FREE US $24.99
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 Dollhouse Miniature Witches' Potion Jar Mermaid Scales SHIPS FREE US $4.99
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 Dollhouse Miniature Witches' Potion Jar North Pole Snow SHIPS FREE US $4.99
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 Dollhouse Miniature Halloween Witches' Skull Scary! SHIPS FREE US $5.99
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 Dollhouse Miniature Halloweeen Witch Skull & Crossbones SHIPS FREE US $3.99
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 Dollhouse Miniature Halloween Witches' Cauldron black SHIPS FREE US $6.99
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 Dollhouse Miniature Witches' Potion Jar Crushed Bones SHIPS FREE US $4.99
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 Dollhouse Miniature Witches' Potion Jar Mummy Dust SHIPS FREE US $4.99
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 Dollhouse Miniature Witches' Potion Jar Pixie Dust SHIPS FREE US $4.99
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 Dollhouse Miniature Witches' Potion Jar Sneezing Powder SHIPS FREE US $4.99
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 Dollhouse Miniature Witches' Potion Jar Witches Brew SHIPS FREE US $4.99
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 Miniature - WITCH - STACKED DIRTY DISHES WITH RAVEN - C. Rohal US $18.51
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 Dollhouse Miniature Witches' Potion Jar Gnat Lotion SHIPS FREE US $4.99
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 Dollhouse Miniature Witches' Potion Jar Crocodile Tears SHIPS FREE US $4.99
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 Dollhouse Miniature Witches' Potion Jar Swamp Slime SHIPS FREE US $4.99
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 Dollhouse Miniature Witches' Potion Jar Black Magic SHIPS FREE US $4.99
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 Dollhouse Miniature Witches' Potion Jar Frog Fat SHIPS FREE US $4.99
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 Dollhouse Miniature Witches' Potion Jar Cocoons SHIPS FREE US $4.99
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 Dollhouse Miniature Witches' Potion Jar Cemetery Dirt SHIPS FREE US $4.99
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 Dollhouse Miniature Witches' Potion Jar Warlock Warts SHIPS FREE US $4.99
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 Dollhouse Miniature Witches' Potion Jar Poison Ivy SHIPS FREE US $4.99
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 Dollhouse Miniature Witches' Potion Jar Broom Straw SHIPS FREE US $4.99
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 Dollhouse Miniature Witches' Potion Jar Wood Stakes SHIPS FREE US $4.99
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 Dollhouse Miniature Witches' Potion Jar Spider Silk SHIPS FREE US $4.99
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 Dollhouse Miniature Witches' Potion Jar Spider Legs SHIPS FREE US $4.99
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 Dollhouse Miniature Witches' Potion Jar Bat Wings SHIPS FREE US $4.99
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 Dollhouse Miniature Witches' Potion Jar Bat Bones SHIPS FREE US $4.99
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 Dollhouse Miniature Witches' Potion Jar Python Venom SHIPS FREE US $4.99
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 Dollhouse Miniature Jar of Poison witch or Halloween SHIPS FREE US $4.99
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 Dollhouse Miniature Witches Halloween Mortar & Pestle SHIPS FREE US $5.99
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 Dollhouse Miniature Halloween Witches' cookbook & spell SHIPS FREE US $3.99
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 Dollhouse Miniature Halloween Witch Skull 1:12 SHIPS FREE US $3.99
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 Miniature 1/2 scale book, A Witch without her Black Cat US $12.00
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 Halloween Witch Miniature Dollhouse Doll House Picture US $12.95
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 Witch Skull Candlestick with Black Candle - Halloween Dollhouse Miniature US $2.95
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 Miniature Ethel Hicks "Wee Halloween Witch" DOLLHOUSE US $25.98
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 1/4 scale Miniature - WITCH HAUNTED CREEPY FACES FILLED CABINET - OOAK C. Rohal US $9.99
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 1/4 scale Miniature - WITCH HAUNTED CAULDRON - OOAK C. Rohal US $9.99
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 1/4 Scale SPOOKY FACE MAN WITCH POT DOLLS HOUSE ARTIST MINIATURE OOAK J.Dunn US $7.89
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 Handmade OOAK Miniature Witch/Wizard Pumpkin Stack 1/12th US $1.58
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 Miniature Cottage Table & Chairs & Handmade OOAK Witch/Wizard Pumpkins 1/12th US $6.32
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 Miniature Handmade OOAK Witch/Wizard Toadstool & Pumpkin Display 1/12th US $15.00
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 Halloween Lill Witches Brew Miniature Dollhouse Picture US $12.95
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 Miniature Cottage Dresser with Handmade OOAK Witch/Wizard Accessories 1/12th US $6.32
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 Dollhouse 5 Piece Halloween Witches Humor Book Set #1 Handcrafted Miniatures US $10.95
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 Miniature Witch Halloween Card/Glitter/Envl: DOLLHOUSE US $2.59
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 Miniature WITCH SPOOKY SKULL PITCHER - OOAK C. Rohal US $9.99
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 Miniature WITCH SCREAMING FACE POTION BOTTLE - OOAK C. Rohal US $9.99
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 Miniature WITCH SKULL POTION BOTTLE - OOAK C. Rohal US $9.99
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 Miniature Woodturning Witch or Wizard LARGE Mortar & Pestle AFRICAN WENGE US $9.99
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 Dollhouse Miniature Wood turning Witch or Wizard Mortar & Pestle LACEWOOD US $8.00
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 Miniature Woodturning Witch TALL Mortar & Pestle - SYCAMORE US $9.99
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 Halloween Witch & Cat Miniature Dollhouse Picture US $12.95
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 Miniature Handmade OOAK Witch/Wizard Mushroom Cauldron 1/12th US $4.74
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 Miniature Handmade Witch/Wizard Tea Set in Wooden Tray 1/12th US $6.32
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 Miniature Handmade OOAK Witch/Wizard Potion & Herb Tray Set 1/12th US $4.74
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 Miniature Handmade OOAK Witch/Wizard Toadstool Display 1/12th US $9.47
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Miniature Witch
Miniature Witch on Broomstick
The Development Trend Of Humidity Sensor
In the industrial and agricultural production, weather, environmental protection, national defense, scientific research, aerospace and other departments are often required to measure and control humidity. However, in conventional environmental parameters, the humidity is the most difficult to accurately measure a parameter. With the dry and wet bulb hygrometer or a hair hygrometer to measure humidity, the method has long been unable to meet the needs of the development of modern science and technology. This is because the measurement of humidity than the measurement of complex multi-temperature, the temperature is measured is an independent, while the humidity is affected by other factors (atmospheric pressure, temperature) effects.
In addition, the calibration of humidity is also a problem. Production abroad humidity calibration equipment prices are very expensive.
In recent years, the humidity sensor research and development at home and abroad have made great strides. Humidity sensor is moving from simple humidity sensor to the integrated, intelligent, multi-parameter detection of the direction of rapid development, in order to develop a new generation of humidity / temperature measurement and control system has created favorable conditions for humidity measurement techniques will also be raised to a new level.
The characteristics of humidity sensor
Humidity sensor is the simplest humidity sensor. Humidity sensor are mainly resistive, capacitive two broad categories.
a humidity sensitive resistor
Humidity resistance is characterized by the substrate covered by a layer of wet material with a sense of the film, when the air in the water vapor adsorbed on a sense of the wet membrane, the components of the resistivity and resistance values are changed to use this feature Humidity can be measured. Many different types of humidity resistance, such as metal oxide humidity resistance, humidity resistance of silicon, ceramic humidity resistance and so on. Humidity resistance has the advantage of high sensitivity, the main drawback is that linearity and interchangeability of products poor.
b Humidity Capacitance
Humidity capacitors are generally made with the polymer film capacitors, polymer materials commonly used in polystyrene, polyimide, cellulose acetate, etc. butyricum. When the ambient humidity changes, the capacitance of the dielectric constant humidity changes, so that it is also a change in capacitance, its capacitance is proportional to the change in relative humidity. The main advantage of capacitive humidity sensor with high sensitivity and product interchangeability is good, fast response, a small amount of moisture lag, easy to manufacture, easy to achieve miniaturization and integration, and its accuracy in general is lower than the humidity sensitive resistor. The main production abroad humidity capacitor manufacturers are Humirel company, Philips Company, Siemens Corporation. To Humirel produced SH1100-type humidity sensor capacitor, for example, the measurement range is (1% ~ 99%) RH, at 55% RH when the electrical capacity of 180pF (typical value). When the relative humidity from 0 to 100%, the changes in capacitance range is 163pF ~ 202pF. The temperature coefficient of 0.04pF / ℃, humidity hysteresis amount of ± 1.5%, response time of 5s.
In addition to resistive, capacitive humidity sensor, there are ionic-type humidity sensor, weight-type humidity sensor (with a sense of the changes in the weight of wet film to change the oscillation frequency), light intensity-type humidity sensor, SAW humidity sensor and so on.
Humidity sensor linearity and anti-pollution poor in the detection of ambient humidity, the humidity sensor to a long-term exposure to the environment under test, it is easily affected by pollution, measurement accuracy and long-term stability.
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