Portable cloud & sky quality detector
The improved portable cloud detector from Lunaticoastro. Measures clouds, sky quality, temperature, humidity, dew point, pressure and wind — with Wi-Fi, GPS and a free smartphone app.
Not designed for permanent outdoor installation. Not rain resistant.
The PocketCW2 packs the full CloudWatcher sensor suite into a 71 × 71 × 27 mm enclosure — everything you need to know whether the sky is safe to observe.
IR sensor reads sky temperature and determines cloud cover in real time.
Measures sky brightness in mpsas. Dichroic UV/IR filter for accurate readings.
Ambient temperature and calculated dew point — essential for moisture risk assessment.
Relative humidity percentage — monitors conditions that affect seeing and optics.
Barometric pressure monitoring for weather trend analysis.
Detects wind presence — helps assess overall observing conditions.
Built-in GPS for location-aware reporting and logging.
Designed for observers who are always on the move — star parties, remote sites, travel — the PocketCW2 gives you full observatory-grade sky monitoring without the installation.
Connect phone and laptop simultaneously over Wi-Fi. No cables, no PC tethering required at the eyepiece.
Dedicated app for iOS and Android. Live readings, configurable alarms and watchdog alerts straight to your phone.
Full protocol support for Voyager, SGPro, N.I.N.A., KStars and more — Safety Monitor and Observing Conditions.
Set custom thresholds for every reading. Watchdog alerts if data stops updating. Battery level alarm included.
Charges and communicates via USB-C. Optional internal rechargeable LiPo battery for fully wireless field use.
71 × 71 × 27 mm, under 85 g. Fits in a jacket pocket — take it to any observing site, any night.
PocketCW2 uses standard protocols so it slots into any automation workflow — on a laptop, over the network, or from your phone.
Portable use only. The PocketCW2 is not designed for permanent outdoor installation and is not rain resistant. Bring it inside when not in use.
Live sensor readings, configurable alarms and custom alert sounds — from your phone or desktop.
| Dimensions | 71 × 71 × 27 mm |
| Weight | < 85 g |
| Power | USB-C (also charges internal battery) |
| Battery | Internal rechargeable LiPo (optional) |
| Connectivity | Wi-Fi 2.4 GHz + USB-C |
| GPS | Built-in |
| Cloud detection | IR sensor |
| Sky quality | mpsas (with dichroic UV/IR filter) |
| Protocols | ASCOM-Alpaca, INDI, INDIGO |
| Sensors | IR, humidity, temperature, pressure, light, wind |
| Outdoor use | Not for permanent install — not rain resistant |
Free shipping to most countries on direct orders. · Dealers worldwide →
Full documentation including first-steps guides for smartphone and computer setup.
Go to documentation →Configuration app, firmware updates and legacy software for the original PocketCloudWatcher.
Go to downloads →How-to guides, integration tutorials, software configuration and community resources.
Browse docs →