Tach Hour Meter, 0 to 20,000 RPM, 12-48V AC/ 6-48V DC

Size chart

Clothing Size Conversion Chart
Category	US	EU	UK	Chest (in)	Waist (in)	Hips (in)
Men	XS	44	34	32-34	26-28	33-35
	S	46	36	34-36	28-30	35-37
	M	48	38	38-40	32-34	39-41
	L	50	40	42-44	36-38	43-45
	XL	52	42	46-48	40-42	47-49
Women	XS	32	6	31-32	24-25	33-34
	S	34	8	33-34	26-27	35-36
	M	36	10	35-36	28-29	37-38
	L	38-40	12-14	37-39	30-32	39-41
	XL	42	16	40-42	33-35	42-44
Youth	XS	128	7	26-28	23-24	26-28
	S	134	8	28-30	24-25	28-30
	M	140	10	30-32	25-26	30-32
	L	146	12	32-34	26-27	32-34
	XL	152	14	34-36	27-28	34-36

Pants Size Conversion Chart
Category	US	EU	UK	Waist (in)	Hip (in)	Inseam (in)
Men	28	44	28	28	34	30
	30	46	30	30	36	31
	32	48	32	32	38	32
	34	50	34	34	40	33
	36	52	36	36	42	34
Women	0	32	4	24	34	30
	2	34	6	25	35	30
	4	36	8	26	36	31
	6	38	10	27	38	32
	8	40	12	28	40	32

Shoes Size Conversion Chart
Category	US	EU	UK	Foot Length (in)
Men	6	39	5.5	9.25
	7	40	6.5	9.625
	8	41	7.5	10
	9	42	8.5	10.25
	10	43	9.5	10.625
	11	44	10.5	11
	12	45	11.5	11.25
	13	46	12.5	11.625
Women	5	35	2.5	8.5
	6	36	3.5	8.875
	7	37	4.5	9.25
	8	38	5.5	9.625
	9	39	6.5	10
	10	40	7.5	10.25
	11	41	8.5	10.625
	12	42	9.5	11
M (Unisex)	5	37	4.5	8.75
	6	38	5.5	9
	7	39	6.5	9.5
	8	40	7.5	10
	9	41	8.5	10.25
	10	42	9.5	10.625
	11	43	10.5	11
	12	44	11.5	11.25

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The digital tachometer hour meter gives you complete engine insight in one compact panel‑mount device, which measures from 0 to 20,000 RPM with ±10 accuracy, runs on 12-48V AC or 6-48V DC external power (backlight enabled), and stores runtime data permanently – helping you optimize performance and track maintenance without guesswork.

Specification

Model	T-RL-HM016H
Signal Input	Ignition coil induction signal for 4-stroke gasoline engines
Clock Range	0 to 99,999 hours (Non-resettable)
Tachometer Range	0 to 20,000 RPM
RPM Accuracy	±10 RPM
Peak RPM Display	Shows for 13 seconds after engine stops
Quiescent Current	9μA (ultra-low power design)
Internal Battery	CR2032 (210mAh)
Optional External Power	AC 12-48V / DC 6-48V (This activates the backlight)
Waterproof Rating	IP65 (suitable for outdoor use & high-pressure washdowns)
Operating Temperature (Device)	-10℃ to 70℃ (14°F to 158°F)
Operating Temperature (LCD)	-30℃ to 80℃ (-22°F to 176°F)
Data Retention	CMOS EEPROM (Permanent memory, no data loss on power failure)
Mounting Type	Panel mount with 2 screws
Housing Material	ABS Plastic
Dimensions (Body)	φ60mm x 49mm (2.36″ x 1.93″)
Display Window Size	30mm x 23.4mm (1.18″ x 0.92″)
Weight	90g (0.2 lbs)
Display Type	Backlit LCD (White light activated by external power + ignition signal)
Ignition Modes	Supports 4 distinct 4-stroke modes (1P1R, 2P1R, 1P2R, 3P1R)
Dual Timer System	Features both a non-resettable total timer and a resettable single timer
Installation	Non-invasive sensor wire wraps around the spark plug wire

Feature

The following features make this digital hour meter a reliable choice for professional and DIY users alike:

±10 RPM Accuracy: This engine hour meter delivers ±10 RPM precision, letting you fine-tune idle speed and catch small engine issues early to keep peak efficiency.
9μA Quiescent Current: With only 9μA current draw, this hour meter for generator keeps its internal battery alive for years when the engine is off, so it is always ready.
CMOS EEPROM Memory: Your accumulated runtime data is stored permanently even if the internal battery dies or external power fails-no resets, no lost service records, just reliable tracking.
IP65 Waterproof Rating: Dust-tight and protected against low-pressure water jets, this rugged design withstands outdoor exposure, pressure washes, and harsh weather, making it ideal for marine, agricultural, and off-road applications.

Installation

Note: The mounting panel must have the correct mounting holes. If not, drill the corresponding holes in the appropriate positions on the panel.

Place the hour meter for air compressor into the mounting slot.
Secure the digital hour meter with two screws.
Referring to the image below, wrap the sensor wire around the engine’s spark plug 5 times or more, then secure it with a cable tie.

Applications

This hour meter for generator and other equipment supports all 4-stroke gasoline engines, including motorcycles, boats, lawn mowers, generators, ATVs, and snowmobiles. It offers four adjustable ignition modes (1P1R, 2P1R, 1P2R, 3P1R) to match different engine cylinder configurations. Whether you need a programmable hour meter for saltwater conditions or a rugged rpm gauge for mowers, this device delivers accurate readings in any environment.

FAQs

Q: How do I know if this tach hour meter works with my engine?

A: This hour run meter is designed for 4-stroke gasoline engines only. It supports four ignition modes (1P1R, 2P1R, 1P2R, 3P1R) and works with most small engines on motorcycles, lawn mowers, boats, tractors, and generators. If your engine is a 4-stroke and has a spark plug, this programmable hour meter will likely work.

Q: Does the backlight stay on all the time?

A: No. The backlit LCD only activates when external power (AC 12-48V or DC 6-48V) is connected AND an ignition signal is present. Without external power, the waterproof hour meter runs on its internal CR2032 battery, and the backlight will not turn on – this preserves battery life.

Q: What happens if the internal battery dies?

A: The internal CR2032 battery powers the hour run meter when external power is absent. If it dies, the CMOS EEPROM memory retains all accumulated runtime data permanently. Simply replace the battery, and your run time meter will display the original total hours – no data loss.