Duct humidity sensors Air quality Category/type
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![Dwyer HS-311 Humidity switch | 0-3 V input sensor | 110 VAC supply voltage. | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/hs_600x600_6f2c3f7c-7ef5-4896-8369-6d7540b21110_medium.gif?v=1719999118)
HS-311 | Humidity switch | 0-3 V input sensor | 110 VAC supply voltage. | Dwyer
Brand: Dwyer
SKU: HS-311
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![Dwyer RHP-3O10 OSA 3% RH transmitter with 4-20 mA RH output. | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/rhp_family_1000x1000_9c4597c0-f137-47ae-b6a0-5966966b15d9_medium.jpg?v=1719999672)
RHP-3O10 | OSA 3% RH transmitter with 4-20 mA RH output. | Dwyer
Brand: Dwyer
SKU: RHP-3O10
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![Dwyer RHP-2O10 OSA 2% RH transmitter with 4-20 mA RH output. | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/rhp_family_1000x1000_763ce7d6-4487-434f-b5ee-0be83c330a9e_medium.jpg?v=1719999558)
RHP-2O10 | OSA 2% RH transmitter with 4-20 mA RH output. | Dwyer
Brand: Dwyer
SKU: RHP-2O10
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![Dwyer RHP-2D20 Duct mount 2% RH transmitter with 0-10 VDC RH output. | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/rhp_family_1000x1000_b7351745-bc04-45cc-acff-cdd0550cfcb2_medium.jpg?v=1719999547)
RHP-2D20 | Duct mount 2% RH transmitter with 0-10 VDC RH output. | Dwyer
Brand: Dwyer
SKU: RHP-2D20
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![Dwyer RHP-2D10 Duct mount 2% RH transmitter with 4-20 mA RH output. | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/rhp_family_1000x1000_aa9fd2e9-7e5d-4a88-a692-0500626cb814_medium.jpg?v=1719999542)
RHP-2D10 | Duct mount 2% RH transmitter with 4-20 mA RH output. | Dwyer
Brand: Dwyer
SKU: RHP-2D10
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![Dwyer HS-112 Humidity switch | 0-1 V input sensor | 230 VAC supply voltage. | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/hs_600x600_b25cb527-c872-4b89-8dd8-9576de9bc3c6_medium.gif?v=1719999253)
HS-112 | Humidity switch | 0-1 V input sensor | 230 VAC supply voltage. | Dwyer
Brand: Dwyer
SKU: HS-112
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![Dwyer 657-1 Relative humidity/temperature transmitter. | Blackhawk Supply](http://blackhawksupply.com/cdn/shop/files/657-657c_family_1000x1000_962a8657-10ba-48a1-bf34-10d4c78a346c_medium.jpg?v=1719998030)
657-1 | Relative humidity / temperature transmitter. | Dwyer
Brand: Dwyer
SKU: 657-1
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Brand: Neptronic
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