Instromet Weather Systems Ltd products

"Over the past decade or so, this simple, reliable, consistent and reasonably-priced sensor has become the sunshine sensor of choice for most of the amateur and hobbyist weather observing community within the UK and Ireland."  Our Stand Alone Sun Duration sensor has proven to be one of our most popular weather monitoring devices to date. The device functions by comparing the output of eight light sensitive diodes surrounding a central shadow pillar. When the output of some of these diodes differ from others, due to a shadow being cast, the control box detects this imbalance and deems the sun to be shining and starts to generate a count (0.01 hours per count).