Technical Specifications: Measuring range: 0.02~10000 gram/m 2 /24 hr SENSOR : 0.0001g (best European brand, tested recommended by NASA) Test Chambers: W 300 (one chamber and a sensor, W320 (Two chambers and two sensor) W330 (three chambers and three sensors) Testing precision: 0.001 gram/m2/24 hr Testing temperature: 10~50 Temperature control precision: ±0.1 Humidity Range: 0%~30%RH (Best recommended as per International standards), (also available as per Chinese standard (5%- 90% RH) Humidity precision: ±2%RH Specimen Size: 80 mm*10cm Silica gel required: 250g / Chamber Testing area: 50.24cm2. Wooden box.