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Small white rectangular sensor with rounded corners, freestanding or adhesive-mounted

Yasorn YSAC859 WiFi Thermometer Hygrometer White

SKU CH-BTBP-MA4SH

A compact WiFi thermometer and hygrometer storing a year of data with app alerts and Alexa voice queries

  • Battery runtimeLRO3-15, 2
  • Measuring range-20 degrees celsius to 60 degrees celsius
  • Accuracy±1ºC/±5% RH
  • Operating conditions-20 degrees celsius / 60 degrees celsius
  • Storage conditions-20 degrees celsius to 60 degrees celsius
  • Product typeUse manual
  • Accurate readings with ±1 °C and ±5 % RH precision
  • Remote monitoring via 2.4 GHz WiFi and mobile app
  • One-year data storage with CSV export for trend analysis
  • Smart automation triggers devices at set temperature or humidity thresholds
  • Compact battery-powered design with adhesive or freestanding mounting options

Yasorn YSAC859 WiFi Monitor

The Yasorn YSAC859 is a compact white hygrometer and thermometer that connects to 2.4 GHz WiFi for remote monitoring via a mobile app. It measures temperature from -20 to 60 degrees Celsius and humidity from 0 to 99 percent RH with an accuracy of ±1 degree Celsius and ±5 percent RH. Data refreshes every two minutes and the device stores one year of history with CSV export. It runs on two included AAA batteries and mounts with adhesive or stands freely.

Who This Suits and Who Should Look Elsewhere

This unit suits homeowners, greenhouse growers and parents who want remote alerts and automated climate control for single rooms. Buyers needing multi-room coverage, wired power or integration with platforms beyond Alexa voice queries should look elsewhere. The monitor only supports 2.4 GHz networks and does not report humidity to voice assistants.

Deciding Specification: 2.4 GHz WiFi Connectivity

The single specification that decides fit is the 2.4 GHz IEEE 802.11 b/g/n wireless interface. Your router must broadcast a 2.4 GHz band for the sensor to connect and stream data to the app. If your network is 5 GHz only, this device will not join it.

How it compares

Measured against everything we stock in Digital Thermometers & Hygrometers, at today’s prices. Recalculated every night.

Price $18.99
Cheaper than about 70% of the 925 comparable items (median $23.99).

Specifications

Product
Brand nameYasorn
Part numberYSAC859
Product typeUse manual
Product colorWhite
Performance
Accuracy±1ºC/±5% RH
Power
Battery runtimeLRO3-15, 2
Size & build
Product dimensions3.35 in × 3.35 in × 1.77 in
Environment & compliance
Operating conditions-20 degrees celsius / 60 degrees celsius
Storage conditions-20 degrees celsius to 60 degrees celsius
More details
Measuring range-20 degrees celsius to 60 degrees celsius

Questions about this item

Which Yasorn YSAC859 capacity or version should I choose?

The Yasorn YSAC859 is offered as a single white unit measuring 3.35 in x 3.35 in x 1.77 in, powered by two included AAA batteries, with no alternative capacities or versions listed.

What does the ±1 °C / ±5 % RH accuracy mean when the sensor is running in my greenhouse?

The sensor reports temperature within 1 °C and humidity within 5 % RH of the true value across its -20 °C to 60 °C range, refreshing data every two minutes so you see near-real-time conditions.

What Wi-Fi standard does the YSAC859 use and what does it limit in practice?

It connects on 2.4 GHz IEEE 802.11 b/g/n only, so it will not join 5 GHz networks and range depends on your router’s 2.4 GHz coverage.

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