For the ultimate in micro-weighing performance choose Sartorius. The SE2 ultra-microbalance delivers an incredible full resolution of 21 million digits, with a capacity of 2.1g and 0.1 ug readability (that's 0.0000001 grams). The ME5 will weigh up to 5g with 1ug readability. Both models stabilize within an ultra fast 10 seconds, for maximum time savings with each weighing operation. Both the Sartorius SE2 and ME5 microbalances are the world's first to feature the EUREKA air buoyancy correction software, allowing true mass measurement and compensation for fluctuations in air density. Built-in software simplifies backweighing, and enable fast, error-free storage of tare weights, initial sample weights and calculation of the amounts backweighed in any order you choose for as many as 50 samples.