About Tachometer: Features: 100% Brand New, High Quality. This product can be used in all gasoline engines with spark plugs. This tachometer is easy to use and is suitable for two-stroke single-cylinder, four-stroke two-cylinder, and gasoline engines that are fired once a week; more suitable for: testing the speed of chain saws and lawn mower gasoline engines, measuring speed range: 100RPM to 30,000 RPM. Due to the inductive design, place the meter near the spark plug cable and it will test the data, Method 1: Keep the meter 3-5CM between the spark plugs and then test. Method 2: Insert the pickup wire into the hole of the meter and attach the metal clip to the spark plug cable. LCD display/low voltage/built-in battery power supply/inductor design/status and press and hold the MODE button to view historical high-speed data. Timing range: 1 minute ~ 99999 minutes (MIN). Speed mode setting: long press the (SET) key, the screen will play 01, 02, 03, 04 in sequence: (Screens 01, 02, 03 respectively display the speed modes corresponding to various engine strokes) Factory default values It is 02 speed mode. When you release the button with your finger, the displayed data will flash for 3 to 5 seconds. After parking, confirm that the speed mode is activated and you can measure. System data reset function: long press (SET), the screen will display 01, 02, 03, 04 in turn; when the screen displays 04, it will flash for 3 to 5 seconds. When your finger releases the button, the display data will flash for 3 to 5 seconds and then stop. Then enter the system reset mode and hold down the MODE key and SET key at the same time until the full screen is displayed (reset to zero). Working time and speed data reset The product will enter power saving mode when not in use and will enter working mode once tested. Specifications: Type: Digital Tachometer Color: Black Measurement Range: 100-30000 RPM Timing Range: 1-99999 Minutes Measurement Accuracy: 1% Resolution: 100% Power supply: 1x CR2450 coin cell battery Retail packaging: Yes Package includes: 1 set x tachometer About hour meter: Features: Suitable for any gas engine. Records and displays until 9,999.9 hours. The hour glass symbol appears and flashes to indicate the counting time. Track the life of vehicle oil changes, valves, adjustments, spark plugs and more. Specifications: Wire length: 1000mm Timekeeping accuracy: 0.1H Timekeeping range: 9999.9H Casing material: ABS Package includes: 1 x digital hour meter 2 x screws 1 x wire