Wescor Vapor Pressure Osmometer VAPRO (Model 5520)

Specifications (see manual for details):

Sample Volume: 10 μL nominal (Larger samples or samples as small as 2 μL can be measured reliably with special procedures)
Measurement Range: Typically 0 to 3200 mmol/kg* @ 25 °C ambient
Measurement Time: 80 seconds
Resolution: 1 mmol/kg
Repeatability Standard deviation: ≤ 2 mmol/kg
Linearity: 2% of reading from 100 to 2000 mmol/kg
Readout: 10 X 6.8 cm LCD
Operating Temperature: 15° to 35 °C ambient Maximum relative humidity 80%(instrument should be at stable temperature before calibrating)
Calibration Automatic using Opti-mole™ osmolality standards