The Kern EMB-S School Balance is a stackable space saving scale for experiment based teaching. A low cost portable laboratory scale designed for use in schools, colleges and universities. Features include simple 2 button operation, LCD display, plastic wipe clean top pan, This is a basic design with weighing only function, under scale weighing possible. The unit is designed to be stackable and has a transport safety feature to prevent the weighing element from overload while being transported or stored. These models are only delivered in a set of 5 units, price given is for the delivery of 5 units, they can not be delivered individually. The calibration cost, the mains adaptor price are for a single scale, if required for each scale then please increase quantity to five. If you order one calibration certificate you will get one of the 5 scales calibrated and no more. Supplied with Batteries only. **This unit is not supplied with a mains adaptor** Please order adaptor from accessories list.