... strength Ttester:1. Description:PN-CT50KB box compression strength tester is our intelligent tester for testing box compression strength of boxes and cartons ... check it suitable or not.2.3 Stack testing: According to national standard, the tester can be used for stack testing ... supply: AC380V, 50Hz, 10A, three-phase, four wires.3.2 Testing accuracy:±1%3.3 Resolution: 1N3.4 Measuring range: 100N-30kN3.5 ...