Parameters:1>.Model: SD32ZSB-22012>.Work Voltage: DC 7V-30V3>.Work current: Within 0.1A4>.Basic precision: (2%+1)5>.Conversion Rate:2 times/sec6>.Control output: 12V 1A(Max)7>.Display screen:4Bit 0.56in Red 8>.Work Temperature: -25~859>.Work Humidity: 5%~95%RH10>.Size: 130*68*50mm4.Key Description: 1>.Long press the "SET" key for 3 seconds to enter the parameter setting, 6 seconds No operation automatically exits the Settings and does not save; 2>.Press SET key continuously to set different parameters, H19000H20000H30004 until H8 parameter is automatically closed; 3>.To adjust parameters, press "Parameter Setting:1>.H1 Upper limit value: 90002>.H2 Lower limit value: 00003>.H3 Rotational speed mode: 4 1: 000.0 r/s ~ 999.9 r/s 2: 00.00 r/s ~ 99.99 r/s 3: 0000 r/s ~ 9999 r/s 4: 0000 r/m ~ 9999 r/m 5: 00.00 r/m ~ 99.99 r/m (ultra-low speed function)4>.H4 Speed ratio: 1.000 Data range 0.001 ~ 9.999, Can be set in terms of the speed ratio.5>.H5 Alarm delay time: 001.06>.H6 Alarm duration: 999.97>.H7 Alarm stop mode: 1 8>.H8 Sensitivity: 1 The value ranges from 1~5, When the parameter is 5, the response is slow and the data jitter is small.Package:1x 12V 4Bit Digital LED Tachometer1x 12V Power Adapter1x Hall Sensor1x Magnet It Is A 12V 4Bit Digital LED Tachometer RPM Speed Meter 5dB Alarm Hall Proximity Switch Sensor With AC110V Power Adapter. Supports Reverse Connection Protection.With Memory Function, Set Parameters after Power Off Not Lost Upper and Lower Limit Alarm,With Shielding Wire, Anti-jamming Switch Minimum Speed:display: Super-low Speed Function 3 R/min, Other Functions 30 R/min.Stop the Alarm Time: Super-low Speed Function For 40 Seconds, Other Features Four Seconds SHOP WITH CONFIDENCE: To Provide You With the Highest Quality Service, If You Have Any Question, Please Feel Free to Contact Us.We Will Provide After-sales Service Until You Are Satisfied. It Is A 12V 4Bit Digital LED Tachometer RPM Speed Meter 5dB Alarm Hall Proximity Switch Sensor With AC110V Power Adapter. Supports Reverse Connection Protection.With Memory Function, Set Parameters after Power Off Not Lost Upper and Lower Limit Alarm,With Shielding Wire, Anti-jamming Switch Minimum Speed:display: Super-low Speed Function 3 R/min, Other Functions 30 R/min.Stop the Alarm Time: Super-low Speed Function For 40 Seconds, Other Features Four Seconds SHOP WITH CONFIDENCE: To Provide You With the Highest Quality Service, If You Have Any Question, Please Feel Free to Contact Us.We Will Provide After-sales Service Until You Are Satisfied.