# Engine Compression Tester 3-piece Forsage FT-903G7 (0–21 bar, M14–M18 adapters)

**URL:** https://aio.lv/en/product--forsage-ft-903g7--11776870
**Data updated:** 2026-03-08 22:46 (EET)
**Category:** Measuring tools
**Manufacturer:** Forsage
**Manufacturer code:** FT-903G7
**EAN:** 5905101388741
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 12.99 €
**Prices and availability valid until:** 2026-07-18 23:59
**Price without VAT (21%):** 10.74 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--forsage-ft-903g7--11776870

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 10.07.2026 | free |
| Pickup points | 15.07.2026 | 1.99 EUR |
| Courier delivery to door | 15.07.2026 | 4.99 EUR |

## Summary description

Handheld 3-piece engine compression tester Forsage FT-903G7 measures cylinder compression from 0 to 21 bar and includes M14–M18 adapters for common spark-plug threads. Designed for diagnosing petrol engines, it helps detect worn rings, valves, and head gasket leaks. Suitable for workshop and field use for routine maintenance and fault finding.

## Long description

The Engine Compression Tester 3-piece Forsage FT-903G7 is a handheld diagnostic gauge intended for checking petrol engine cylinder compression between 0 and 21 bar. The kit includes adapters that fit common spark-plug threads, enabling direct measurement through the spark-plug hole without engine disassembly. It is designed for workshop and field use to support routine maintenance and fault finding by identifying low compression caused by worn piston rings, leaking valves, or a compromised head gasket.
Advantages
This three-piece tester provides a wide measurement range up to 21 bar for accurate diagnosis of petrol engine cylinders. The adapters cover common M14–M18 spark-plug sizes, ensuring compatibility with most passenger car and light commercial engines. The handheld gauge is compact and simple to operate, delivering quick readings that assist technicians and DIY users in isolating mechanical issues without time-consuming teardown. Durable construction and clear scale markings improve reliability and readability during repetitive checks.
Suitable for
Routine compression checks during scheduled maintenance
Diagnosing worn piston rings or cylinder sealing issues
Detecting valve leaks and head gasket failures
Field inspections and mobile repair services
Automotive workshops and home garages
Key specifications
Measurement range: 0–21 bar
Gauge type: handheld analog compression gauge
Adapter sizes included: suitable for M14 to M18 spark-plug threads
Application: petrol (gasoline) engines
Construction: metal fittings with rubber hose for spark-plug access
How to use
Warm the engine to normal operating temperature, then disable ignition and fuel supply according to the vehicle manufacturer’s safety instructions. Remove the spark plug from the cylinder to be tested and screw the appropriate adapter into the spark-plug thread, ensuring a secure seal. Connect the tester hose to the adapter, crank the engine for a few compression strokes and observe the gauge. Record the peak compression reading and repeat the process for each cylinder. Compare measured values against manufacturer specifications and between cylinders to identify relative differences that indicate wear or leakage.
Usage recommendations
Use consistent cranking duration and battery condition for each test to ensure comparable results. If readings are low, perform a wet compression test by adding a small amount of oil into the cylinder and repeating the measurement to help distinguish worn rings from valve or gasket leaks. Always follow safety precautions: work in a well-ventilated area, prevent accidental engine starts, and consult vehicle service data for acceptable compression ranges.

## FAQ

### How much does the Engine Compression Tester Forsage FT-903G7 cost, and is it available for purchase?

The price is 12.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 361 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 10.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Forsage products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Forsage service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

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