The PAL is a completely new and redesigned digital hand-held instrument that will change the traditional conceptions of refractometers. The PAL's surprisingly compact size allows you to easily carry it around and use it indoors as well as outdoors. Light & Compact, 100g. Ergonomically designed for one-handed operation. High-temperature samples can be measured. Sample size 2-3 drops. Calibration with water only. Convenient Storage case.