--- product_id: 29999236 title: "Rotation Tester and AC Detector for Circulating Pumps etc" brand: "geonordic" price: "Rp312665" currency: IDR in_stock: true reviews_count: 8 category: "Geonordic" url: https://www.desertcart.id/products/29999236-rotation-tester-and-ac-detector-for-circulating-pumps-etc store_origin: ID region: Indonesia --- # Sensitive AC magnetic field detection Instant rotation direction detection Solenoid valve activation confirmation Rotation Tester and AC Detector for Circulating Pumps etc **Brand:** geonordic **Price:** Rp312665 **Availability:** ✅ In Stock ## Summary > 🔧 Spin, detect, and diagnose like a pro—never miss a beat! ## Quick Answers - **What is this?** Rotation Tester and AC Detector for Circulating Pumps etc by geonordic - **How much does it cost?** Rp312665 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.id](https://www.desertcart.id/products/29999236-rotation-tester-and-ac-detector-for-circulating-pumps-etc) ## Best For - geonordic enthusiasts ## Why This Product - Trusted geonordic brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Spin to Win:** Visual confirmation of pump rotation in seconds - • **FOMO-Free Fixes:** Avoid costly plumber visits with instant troubleshooting - • **Solenoid Sensei:** Quickly verifies solenoid valve energization for HVAC pros - • **Pocket-Sized Power:** Compact keyring design for on-the-go diagnostics - • **Magnetic Field Whisperer:** Detects elusive AC fields without complex tools ## Overview The Geonordic Rotation Tester and AC Detector is a compact, battery-powered tool designed to instantly indicate rotation direction and detect AC magnetic fields. Ideal for plumbers, HVAC technicians, and heating contractors, it visually confirms pump operation and solenoid valve energization, enabling fast, reliable diagnostics and preventing costly system failures. ## Description This very useful device quickly indicates rotation direction. It can also be used to detect the magnetic field produced by AC. The red and white disc spins on its axle when the tester is placed close to a sufficiently strong AC field. When placed close to a pump that is turning the disc will also rotate. No plumber or heating contractor should be without this very handy keyring tool. Review: Visual confirmation that pump is working ! - Bought a house that had a Watts 500800 Instant Hot Water recirculation system. There were two "sensors", one in the kitchen, the other in the master bedroom. These sensors are valves that are installed between the hot and cold lines under a faucet. They close in response to hot water, and open when the water cools. The idea is that, when the "hot" water near the faucet isn't hot, the valve opens, and the pump (which is on the water heater hot output) forces water through the hot line, then through the open valve, into the cold line. When really hot water reaches the valve, it closes. So, when you then tun on the hot faucet, the water is instantly hot. Correspondingly, because some warm water has been pushed into the cold line, when you turn on the cold faucet the water is a little warm, but it quickly cools down as the hot water gets flushed out. The system didn't seem to do much. Took a long time to get hot water, especially in the master bedroom at the far end of the house. I wondered if the pump was working. I could hear a noise, but didn't know if it was actually rotating. Eventually, I bought this indicator, and held it up to the pump, at the water heater. It didn't spin. So I got a rubber mallet, and gave the pump casing a couple of fairly gentle taps. Held the indicator up again - it was spinning (more slowly than I expected, but definitely spinning). That night, my wife complained that the cold water in the master bedroom was running hot. So I tested the sensor/valve and, sure enough, it wasn't working - it did not close, even when the hot water faucet was pouring out near-scalding water. We had not experienced the "hot cold water" before, because the pump wasn't spinning, but thanks to the rubber mallet, the pump had been constantly pushing hot water into the cold water line. Next day, installed a new (steel) sensor/valve. Now everything is working well. Since I probably won't need to use the indicator for anything else, I've taped it to the pump. See video. Turning like a champ. So an $18 outlay saved me from paying a plumber, and helped me turn a failing system into a working one. Review: For those technicians in the HVAC industry for a fast confirmation that solenoids are energized. - I have used this to test 7 solenoid. I use it to test the solenoid on the reversing valve to see if it’s energized. I also use this on my ice cube relays and transformer. So far, it worked as expected. However, it does not work on pumps; especially if the pumps have a tick body. The ticker the frame or body of the pumps, the less it’s going to work. I got it to test solenoids and not pumps. That is why I gave it a five start. I am getting two more. ## Features - Quickly indicates rotation direction - Detects AC fields - Detects solenoid valves ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00VV6CLPO | | Best Sellers Rank | #15,533 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #10 in Utility Pumps | | Brand Name | Geonordic | | Color | White,Red | | Customer Reviews | 4.2 4.2 out of 5 stars (1,109) | | Global Trade Identification Number | 00701722949713 | | Item Dimensions | 3.1 x 2.1 x 0.4 inches | | Item Weight | 9.07 g | | Manufacturer | Geonordic | | Measurement Type | AC Field Detector | | Model | 7-201 | | Part Number | 7-201 | | Power Source | Battery Powered | | Style Name | Compact,Industrial | | UPC | 701722949713 | | Unit Count | 1.0 Count | ## Product Details - **Brand:** Geonordic - **Color:** White,Red - **Item Weight:** 9.07 g - **Power Source:** Battery Powered - **Style:** Compact,Industrial ## Images ![Rotation Tester and AC Detector for Circulating Pumps etc - Image 1](https://m.media-amazon.com/images/I/51ASzeh-XRL.jpg) ## Questions & Answers **Q: Will this work on DC solenoids?** A: Probably not. Download the Danfoss ref tools app, it has a magnetic tool in the app that you can use for both motors and solenoid valves. **Q: Is this for a pack of 50 Company's give these away all the time for free?** A: No, it’s not for a pack of 50, read the description **Q: what kind of motor does this work on , I have tried it one a 1/2 hp all the way up to 1000hp and it does not work they are all ac drive motors** A: These work on the 1/25th+ holiday pumps I install on hydronic heating systems. Hold the disc up against the end of the motor and it will spin the same direction as the electrical flow...........it does not tell you that the impeller is rotating it only tells you that there is power to the motor and its trying to turn the impeller, and which direction it is trying to turn it. **Q: Does that work on taco 007 ?** A: This item did I not work on anything! Download the danfoss app instead. It’s free! ## Customer Reviews ### ⭐⭐⭐⭐⭐ Visual confirmation that pump is working ! *by S***R on November 24, 2024* Bought a house that had a Watts 500800 Instant Hot Water recirculation system. There were two "sensors", one in the kitchen, the other in the master bedroom. These sensors are valves that are installed between the hot and cold lines under a faucet. They close in response to hot water, and open when the water cools. The idea is that, when the "hot" water near the faucet isn't hot, the valve opens, and the pump (which is on the water heater hot output) forces water through the hot line, then through the open valve, into the cold line. When really hot water reaches the valve, it closes. So, when you then tun on the hot faucet, the water is instantly hot. Correspondingly, because some warm water has been pushed into the cold line, when you turn on the cold faucet the water is a little warm, but it quickly cools down as the hot water gets flushed out. The system didn't seem to do much. Took a long time to get hot water, especially in the master bedroom at the far end of the house. I wondered if the pump was working. I could hear a noise, but didn't know if it was actually rotating. Eventually, I bought this indicator, and held it up to the pump, at the water heater. It didn't spin. So I got a rubber mallet, and gave the pump casing a couple of fairly gentle taps. Held the indicator up again - it was spinning (more slowly than I expected, but definitely spinning). That night, my wife complained that the cold water in the master bedroom was running hot. So I tested the sensor/valve and, sure enough, it wasn't working - it did not close, even when the hot water faucet was pouring out near-scalding water. We had not experienced the "hot cold water" before, because the pump wasn't spinning, but thanks to the rubber mallet, the pump had been constantly pushing hot water into the cold water line. Next day, installed a new (steel) sensor/valve. Now everything is working well. Since I probably won't need to use the indicator for anything else, I've taped it to the pump. See video. Turning like a champ. So an $18 outlay saved me from paying a plumber, and helped me turn a failing system into a working one. ### ⭐⭐⭐⭐⭐ For those technicians in the HVAC industry for a fast confirmation that solenoids are energized. *by W***6 on June 20, 2025* I have used this to test 7 solenoid. I use it to test the solenoid on the reversing valve to see if it’s energized. I also use this on my ice cube relays and transformer. So far, it worked as expected. However, it does not work on pumps; especially if the pumps have a tick body. The ticker the frame or body of the pumps, the less it’s going to work. I got it to test solenoids and not pumps. That is why I gave it a five start. I am getting two more. ### ⭐⭐⭐⭐⭐ Clever little device *by R***S on March 13, 2026* Mine arrived in fine shape, even though it wasn't packed very well, just in one of the paper Amazon bags. It works fine on Grundfos UPS 15-42f pumps; I could have used this thingie 20 years ago when I first had to troubleshoot this hydronic system. I'm still not sure if the rotor is actually turning or if it is just a rotating magnetic field (but I happen to know it is because I stuck a screwdriver in there!) ## Frequently Bought Together - Rotation Tester and AC Detector for Circulating Pumps etc - Solenoid Magnet, Solenoid Valve Magnet Tool #TLMKC, Solenoid Valve Troubleshooting Magnet Tool 18mm, Fits Most Industry Valves, 1 Pcs - Solenoid Tester, Solenoid Magnet Tool to Detects Ac Fields, and Rotation Tester for Circulating Pumps --- ## 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.id/products/29999236-rotation-tester-and-ac-detector-for-circulating-pumps-etc](https://www.desertcart.id/products/29999236-rotation-tester-and-ac-detector-for-circulating-pumps-etc) --- *Product available on Desertcart Indonesia* *Store origin: ID* *Last updated: 2026-05-08*