Javac Procharge100 Refrigerant Charging Scales.
Part no. G58610
Model : Procharge 100 
Weight range : 100kg
Accuracy : +/- 0.5%
Resolution : 5 gram
Units : kgs. or lbs.
Weight : 2.485kg
Power supply : 1 x 9v battery (supplied)
Battery life : 30hrs continuous use
Comes in carry case.
 
these are working perfect. comes as seen in pics. all ready for work, in great condition.