|  | H7E-C is a 8-digit total counter | 
                    
                        |  | H7E-C can switch between 30Hz and 1KHz signal via DIP  switch | 
                    
                        |  | H7E-T is a 7-digit time counter | 
                    
                        |  | H7E-T can switch between 2 models via DIP  switch H7E-TA:999999.9h/3999d23.9h
 H7E-TB:999h59m59s/9999h59.9m
 | 
                    
                        |  | Key-protect switch to prevent faulty reset  key operation | 
                    
                        |  | Backlight option (requires AC/DC 24V power  supply) | 
                    
                        |  | 60 mm short body design |