| Accuracy | 
            ±0.5% Full Scale | 
        
        
            | RPM Ranges | 
            
            
                
                    
                        HTM-100F/M-ATEX 
                        10-10,000 rpm 
                        x1: 10-100 
                        x10: 100-1,000 
                        x100: 1000-10,000 | 
                        HTM-500F/M-ATEX 
                        30-50,000 rpm 
                        x1: 30-500 
                        x10: 300-5,000 
                        x100: 3000-50,000 | 
                     
                
             
             | 
        
        
            Surface Speed Range 
            100-Series Models | 
            
            
                
                    
                        HTM-100F-ATEX 
                        5-5,000 ft/min 
                        x1: 5-50 
                        x10: 50-500 
                        x100: 500-5,000 | 
                        HTM-100M-ATEX 
                        1-1,000 m/min 
                        x1: 1-10 
                        x10: 10-100 
                        x100: 100-1,000 | 
                     
                
             
             | 
        
        
            Surface Speed Range 
            500-Series Models | 
            
            
                
                    
                        HTM-500F-ATEX 
                        15-25,000 ft/min 
                        x1: 15-250 
                        x10: 150-2,500 
                        x100: 1,500-25,000 | 
                        HTM-500M-ATEX 
                        3-5,000 m/min 
                        x1: 3-50 
                        x10: 30-500 
                        x100: 300-5,000 | 
                     
                
             
             | 
        
        
            Surface Speed Range 
            Metric Models | 
            must divide value on dial by 10 
            HTM-100M-ATEX and HTM-500M-ATEX models only | 
        
        
            | Dial | 
            3 inch (70 mm) diameter, 2-color grid 
            RPM-Black and SURFACE SPEED-Red | 
        
        
            | Dimensions - tach | 
            6.1 x 3.4" x 2.2" (155 x 85 x 55 mm) | 
        
        
            | Dimensions - kit | 
            9.9" x 8.2" x 2.4" (252 x 207 x 60 mm) | 
        
        
            | Housing Material | 
            Plastic | 
        
        
            | Weight | 
            10.6 oz (300 g) | 
        
        
            | Warranty | 
            1 year | 
        
        
            | Operating Temp. | 
            32°F -104°F (0°C - 40°C) |