Developed and built in Lancashire, UK
Wifi Temperature
Monitor
Three sensors. One device. Know your telescope, dome, and outside air temperature simultaneously — from the comfort of your seat.
Developed and built in Lancashire, UK
Three sensors. One device. Know your telescope, dome, and outside air temperature simultaneously — from the comfort of your seat.
What you get
Monitor up to three locations simultaneously — telescope tube, dome interior, and outside air, or any combination that suits your setup.
Add to your iPhone or Android home screen like a native app. Temperatures update live every five seconds — no separate app to install.
Red tinted OLED screen, preserving your dark adaptation. Four brightness levels, adjustable from the device or your phone.
Label each sensor for your own setup — Scope, Dome, Outside, Mirror, or anything up to seven characters. Names can be set during initial configuration or changed at any time from the web app.
Hold the button on power-up to enter setup mode. Your phone connects to the device's own WiFi hotspot — no cables, no software, no computer required.
Switch between units at any time from the device menu or the web app. The setting persists across power cycles.
Each reading shows a trend indicator — rising, falling, or steady — so you can see at a glance which way temperatures are heading. Session minimum and maximum values are tracked and displayed in the web app, with a one-tap reset.
For any future firmware updates, this can be updated over your WiFi network — no USB cable or computer tools required.
The OLED display can be set to dim automatically after a period of inactivity — 1, 5, or 10 minutes — to reduce light pollution during long sessions. A simple button press wakes it instantly.
Powered by any USB charger or power bank. No proprietary connectors, no batteries to replace mid-session.
Every unit is individually assembled, tested, and configured by hand. Supplied ready to use — just plug in and observe.
The display and the web app all use a deep red and purple colour scheme. Red light causes far less pupil contraction than white — preserving the dark adaptation you've spent twenty minutes building. Conventional white-screen devices cost you that in seconds.
Applications
Monitor when your telescope mirror or lens has cooled to match the outside air — the point at which seeing improves dramatically and stars snap into focus.
Watch the gap between optic temperature and dew point. A warming dew heater shows up immediately — know it's working without leaving your seat.
Track the difference between inside your dome or shed and the outside air — useful for ventilation decisions and understanding local seeing conditions.
Temperature shifts cause focus drift in long imaging runs. A sensor on the focuser tube lets you correlate temperature changes with focus position as you image.
Mount a sensor inside a storage area or equipment case. Know the temperature before committing sensitive electronics or optics to a cold or damp environment.
A simple, reliable outside temperature sensor that updates on your phone. No subscription, no cloud service — just a number on your home screen.
Web app
Visit the device's address once in Safari or Chrome, tap Add to Home Screen, and it's there like any other app. No App Store, no account, no subscription.
Temperatures update automatically every 5 seconds. A live indicator shows the connection status — if the device loses power, you'll see immediately.
The web app's Device Settings panel lets you switch temperature units, adjust screen brightness, rename sensors, set the screen timeout, and reset session min/max values — all without touching the device. Changes take effect immediately.
Open the IP address in any browser on your laptop or observatory computer. Chrome and Edge can install it as a standalone desktop app.
Technical specification
| Microcontroller | ESP32 based — Chosen for its reliability, inbuilt connectivity and superb energy efficiency |
| Temperature sensors | 3× temperature sensors with 1m cable. Range −55°C to +125°C, accuracy ±0.5°C. |
| Display | Inbuilt OLED — 4 brightness levels, adjustable from device or web app. Deep red colour scheme for night vision. |
| Update interval | OLED display on the device and web app: every 5 seconds |
| Configuration | Easy WiFi setup via any phone browser. All settings stored on the device — won't be lost on power cycles |
| Controls | Single multi-function button — Adjust device settings easily, even with gloved hands |
| Firmware updates | Over-the-air (OTA) updates via wifi — leave the device in place and update in minutes |
| Power supply | 5V via USB. Typical draw <200 mA. Compatible with any 5V USB phone charger or power bank |
| Sensor cable length | 1 metre cables supplied. Alternative lengths available (2m, 3m, 5m, 10m) if required |
| Temperature units | Celsius and Fahrenheit — switchable at any time from device or web app |
| Enclosure | 3D printed, custom designed for the device |
| Software | v2.0 — full user guide available online, quick start guide supplied with the device |
| Made in | Lancashire, UK |
Product Photography
Order
Including delivery to mainland UK · International shipping available — contact for rates
Each unit is made to order · Typical lead time 5–7 days