--- product_id: 166897121 title: "Samfox 4-20mA Signal Generator, 3-21mA Adjustable High Precision DC Current Analog Simulator Two-Wire Transducer Test Signal Generator DIY Kit JS-420ISG-V2" brand: "samfox" price: "£22.84" currency: GBP in_stock: true reviews_count: 4 category: "Samfox" url: https://www.desertcart.co.uk/products/166897121-samfox-4-20ma-signal-generator-3-21ma-adjustable-high-precision store_origin: GB region: United Kingdom --- # Clear LCD with multi-mode display Rotary encoder for seamless adjustment 0.01mA ultra-precise accuracy Samfox 4-20mA Signal Generator, 3-21mA Adjustable High Precision DC Current Analog Simulator Two-Wire Transducer Test Signal Generator DIY Kit JS-420ISG-V2 **Brand:** samfox **Price:** £22.84 **Availability:** ✅ In Stock ## Summary > ⚡ Master your signal game with precision and ease! ## Quick Answers - **What is this?** Samfox 4-20mA Signal Generator, 3-21mA Adjustable High Precision DC Current Analog Simulator Two-Wire Transducer Test Signal Generator DIY Kit JS-420ISG-V2 by samfox - **How much does it cost?** £22.84 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/166897121-samfox-4-20ma-signal-generator-3-21ma-adjustable-high-precision) ## Best For - samfox enthusiasts ## Why This Product - Trusted samfox brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Flexible Output Range:** Customize between 3-21mA or 4-20mA to match any testing scenario. - • **Intuitive LCD Display:** Switch effortlessly between actual current, percentage, and frequency views. - • **Effortless Calibration:** Linear output calibration ensures your device reads exactly what you see. - • **User-Friendly Interface:** Rotary encoder and non-polarity terminals make setup quick and foolproof. - • **Pinpoint Precision Control:** Achieve ±0.01mA accuracy for flawless current simulation. ## Overview The Samfox JS-420ISG-V2 is a compact, high-precision 4-20mA signal generator designed for professional testing and calibration of two-wire transducers. Featuring an ultra-accurate 0.01mA output, a versatile LCD display with multiple modes, and a user-friendly rotary encoder, it offers customizable output ranges and easy calibration to ensure your device readings are perfectly aligned. Ideal for panel mounting and industrial applications, this DIY kit streamlines signal simulation with reliable performance and intuitive controls. ## Description Features: This signal generator can use 4-20mA to generate voltage and control the current in the circuit. Accuracy up to 0.01; Liquid crystal display; Rotary encoder adjustment ; Two connection terminals are non polarity.Output range can be set; 4-20mA (device control) / -21mA (signal debugging)Display mode can be set, it is convenient for you to see the valueLinear output can be calibrated; The actual output can be consistent with the display of customer device.Output storage: automatic storage & manual storage.2-9 programmable outputs: just rotate the encoder to set.Specification: Item Model: JS-420ISG-V2Supply Voltage: 15 - 30VOutput Range: 4 - 20mA / 3 - 21mADisplay: Actual Current / Percentage / HzSampling Resistance: ＜500 ΩOutput Accuracy: 0.5%Display Accuracy: 0.01Color: Shown As PicturesSize: Approx. 8 * 4.2 * 4.5cm / 3.14 * 1.65 * 1.77inchWeight: 44gType: Signal GeneratorPackage List:1 * Signal Generator1 * Manual Review: Great piece - This is panel mounted perfection! Review: Panel-mount for 1mm plate - Panel-mount for 1mm plate. Works perfect ## Features - This signal generator can use 4-20mA to generate voltage and control the current in the circuit. - Accuracy up to 0.01; Liquid crystal display; Rotary encoder adjustment ; Two connection terminals are non polarity. - Output range can be set; 4-20mA (device control) / -21mA (signal debugging) - Display mode can be set, it is convenient for you to see the value - Linear output can be calibrated; The actual output can be consistent with the display of customer device. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07TGJPPJL | | Best Sellers Rank | #277,617 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #138 in Function Generators | | Date First Available | June 25, 2019 | | Item Weight | 2.08 ounces | | Manufacturer | samfox | | Package Dimensions | 3.43 x 2.48 x 2.28 inches | ## Images ![Samfox 4-20mA Signal Generator, 3-21mA Adjustable High Precision DC Current Analog Simulator Two-Wire Transducer Test Signal Generator DIY Kit JS-420ISG-V2 - Image 1](https://m.media-amazon.com/images/I/519a5bvp6gL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great piece *by S***. on March 27, 2026* This is panel mounted perfection! ### ⭐⭐⭐⭐⭐ Panel-mount for 1mm plate *by R***F on February 6, 2025* Panel-mount for 1mm plate. Works perfect ### ⭐⭐⭐⭐⭐ 4-20 ma Signal Generator *by R***. on January 9, 2024* Works great and good value for the cost. I do instrument and control work and this is good low cost piece of test equipment. ## Frequently Bought Together - Samfox 4-20mA Signal Generator, 3-21mA Adjustable High Precision DC Current Analog Simulator Two-Wire Transducer Test Signal Generator DIY Kit JS-420ISG-V2 - Current Loop, Two-Wire High Accuracy 4-20mA Current Loop Signal Generator LCD Transducer Test Signal Current - DROK 4-20mA Generator, Adjustable Signal Generator, DC 0-10V 0 4-20mA Current Voltage Analog Simulator for Value Adjusting PLC Panel LED Testing --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/166897121-samfox-4-20ma-signal-generator-3-21ma-adjustable-high-precision](https://www.desertcart.co.uk/products/166897121-samfox-4-20ma-signal-generator-3-21ma-adjustable-high-precision) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-16*