---
product_id: 34589643
title: "Aviation Fuel Tester with Built-in Cowl Screwdriver, Model 391S, Clear and Yellow"
brand: "smartsf"
price: "₨11448"
currency: LKR
in_stock: true
reviews_count: 8
category: "Smart Sf"
url: https://www.desertcart.lk/products/34589643-aviation-fuel-tester-with-built-in-cowl-screwdriver-model-391s
store_origin: LK
region: Sri Lanka
---

# Aviation Fuel Tester with Built-in Cowl Screwdriver, Model 391S, Clear and Yellow

**Brand:** smartsf
**Price:** ₨11448
**Availability:** ✅ In Stock

## Quick Answers

- **What is this?** Aviation Fuel Tester with Built-in Cowl Screwdriver, Model 391S, Clear and Yellow by smartsf
- **How much does it cost?** ₨11448 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/products/34589643-aviation-fuel-tester-with-built-in-cowl-screwdriver-model-391s)

## Best For

- smartsf enthusiasts

## Why This Product

- Trusted smartsf brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Description

With its compact size, no-hassle probe, and % alcohol markings, this fuel tester has been a standard for years. Sold Individually, 5 per Retail Display Box

Review: Compact, Reliable, and Pilot-Friendly - The Aviation Fuel Tester with Built-in Cowl Screwdriver is a super handy tool for quick pre-flight checks. The clear tube makes it easy to spot water or debris in the fuel, and the built-in screwdriver is perfect for opening cowls or fuel caps without carrying extra tools. It’s lightweight, simple to use, and fits easily in any flight bag. A great, affordable must-have for any pilot doing regular pre-flight inspections.
Review: Price Right and it works - Good quality, love the screw driver options. Works as intended.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0016BQEGQ |
| Best Sellers Rank | #45,609 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #187 in Screwdrivers |
| Brand | SmartSF |
| Color | yellow |
| Date First Available | March 21, 2008 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 1.76 ounces |
| Item dimensions L x W x H | 5.51 x 6.69 x 9.84 inches |
| Item model number | 391S |
| Manufacturer | Daansen USA, Inc. |
| Measurement Type | Alcohol Content Meter |
| Min. Operating Voltage | 3 Volts |
| Power Source | Battery Powered |
| Product Dimensions | 5.51 x 6.69 x 9.84 inches |
| Style | Compact |

## Product Details

- **Brand:** SmartSF
- **Color:** yellow
- **Item dimensions L x W x H:** 5.51 x 6.69 x 9.84 inches
- **Power Source:** Battery Powered
- **Style:** Compact

## Images

![Aviation Fuel Tester with Built-in Cowl Screwdriver, Model 391S, Clear and Yellow - Image 1](https://m.media-amazon.com/images/I/3151bCRVqvL.jpg)

## Questions & Answers

**Q: What is a aviation fuel tester for**
A: A Fuel tester is used to drain fuel at the lowest point in an aircraft fuel tank. The fuel drains into the clear part of the tester and you can see if there is any water and/or sediment (dirt) in the fuel. This is part of a pilot's pre-flight checks.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Compact, Reliable, and Pilot-Friendly
*by R***L on December 10, 2025*

The Aviation Fuel Tester with Built-in Cowl Screwdriver is a super handy tool for quick pre-flight checks. The clear tube makes it easy to spot water or debris in the fuel, and the built-in screwdriver is perfect for opening cowls or fuel caps without carrying extra tools. It’s lightweight, simple to use, and fits easily in any flight bag. A great, affordable must-have for any pilot doing regular pre-flight inspections.

### ⭐⭐⭐⭐⭐ Price Right and it works
*by D***B on September 22, 2025*

Good quality, love the screw driver options. Works as intended.

### ⭐⭐⭐⭐⭐ As advertised.
*by F***G on January 10, 2026*

Great sump

## Frequently Bought Together

- Aviation Fuel Tester with Built-in Cowl Screwdriver, Model 391S, Clear and Yellow
- Luso Aviation Fuelhawk Aircraft Fuel Gauge, Cessna 172-26.5 Gallon
- FAR/AIM 2025: Federal Aviation Regulations/Aeronautical Information Manual (ASA FAR/AIM Series)

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**Shop now:** [https://www.desertcart.lk/products/34589643-aviation-fuel-tester-with-built-in-cowl-screwdriver-model-391s](https://www.desertcart.lk/products/34589643-aviation-fuel-tester-with-built-in-cowl-screwdriver-model-391s)

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*Product available on Desertcart Sri Lanka*
*Store origin: LK*
*Last updated: 2026-03-17*