
So I used three of these to monitor hot water output in a small system. They were easy to use, seemed well constructed and precisely matched. The only gripe I have is that they aren't entirely weatherproof and there has actually been condensation behind the glass, making it difficult to read in places. However, the condensation disappeared after a few days of sunshine and low humidity.

π General Tools MMD4E: Highly Accurate Moisture Meter with High, Medium, Low Measurements
8 Review

π‘οΈ Inkbird Max 1200W Temperature Controller: Optimal Control for Greenhouse Climate
8 Review

π² Pin-Type Wood Moisture Meter Detector
10 Review

Enhance Detection Accuracy with Klein Tools ET140 Non Destructive Detection
8 Review

π Dioxide Controller for Digital Gas Monitoring
5 Review

π Enhanced Precision with Backlit Professional Manometer for Differential Ventilation
6 Review

π§ UEi Test Instruments DAFM3B Digital Multimeter
6 Review

Portable Handheld Manometer π for Accurate Pressure Differential Measurement
5 Review