--- product_id: 14401637 title: "HCHO Index Monitor, Formaldehyde (Oxymethylene) Temperature and Humidity Air Quality Pocket Indicator [FH20] Accurate AQI Datalogger Indoor Detector *Two-year Warranty*" brand: "santacary" price: "VT223" currency: VUV in_stock: false reviews_count: 5 url: https://www.desertcart.vu/products/14401637-hcho-index-monitor-formaldehyde-oxymethylene-temperature-and-humidity-air-quality store_origin: VU region: Vanuatu --- # Humidity response in under 8 seconds 0.01 ppm ultra-precise formaldehyde detection Temperature accuracy to 0.1°C/°F HCHO Index Monitor, Formaldehyde (Oxymethylene) Temperature and Humidity Air Quality Pocket Indicator [FH20] Accurate AQI Datalogger Indoor Detector *Two-year Warranty* **Brand:** santacary **Price:** VT223 **Availability:** ❌ Out of Stock ## Summary > 🌿 Breathe Smart, Live Sharp — Your Pocket Guardian Against Invisible Hazards ## Quick Answers - **What is this?** HCHO Index Monitor, Formaldehyde (Oxymethylene) Temperature and Humidity Air Quality Pocket Indicator [FH20] Accurate AQI Datalogger Indoor Detector *Two-year Warranty* by santacary - **How much does it cost?** VT223 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/14401637-hcho-index-monitor-formaldehyde-oxymethylene-temperature-and-humidity-air-quality) ## Best For - santacary enthusiasts ## Why This Product - Trusted santacary brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Reliable & Ready:** No batteries needed and backed by a two-year warranty—effortless, dependable air quality vigilance. - • **Compact Powerhouse:** World’s smallest and lightest formaldehyde monitor—carry clean air awareness anywhere. - • **Real-Time Trend Insights:** Track formaldehyde levels over 8 days with intuitive trend displays—stay ahead of air quality shifts. - • **Multi-Parameter Monitoring:** Simultaneously measures temperature and humidity with selectable °C/°F for comprehensive environment control. - • **Pinpoint Formaldehyde Safety:** Detects hazardous formaldehyde vapors with 0.01 ppm resolution for ultimate indoor air confidence. ## Overview The FH20 HCHO Index Monitor by Santacary is a cutting-edge, pocket-sized device designed to detect formaldehyde concentrations as low as 0.01 ppm with an electrochemical sensor. It also measures ambient temperature and relative humidity with high precision and rapid response times. Featuring an 8-day trend display and a lightweight design, it offers professionals a reliable, portable solution for maintaining healthy indoor air quality, all supported by a two-year warranty. ## Description HCHO Specification Measurement Range: 0~5.0ppm (0~6.25mg/m3) Resolution: 0.01ppm Response Time: <30 seconds Green: <0.08 mg/m3 or <0.06ppm; Yellow: 0.08~0.3 mg/m3 or 0.06~0.24ppm; Red: >0.3 mg/m3 or >0.24ppm Temperature Specification Display Resolution: 0.1°C (0.1°F) Response Time: 5~30 seconds RH Specification Display Resolution: 1%RH Response time: <8 seconds for 63% of step change ## Features - FH20 detects low level concentrations of hazardous formaldehyde vapors with a resolution of 0.01 ppm - Electrochemical sensor for formaldehyde detection - Trend display available for easy understanding about formaldehyde change in up to 8 days - FH20 should be the smallest and the lightest formaldehyde monitor in the world - FH20 can also measure the ambient temperature and the relative humidity; Selectable °C and °F ## Technical Specifications | Specification | Value | |---------------|-------| | Manufacturer | Santacary | | Item Weight | 2.4 ounces | | Package Dimensions | 6.9 x 5.4 x 2.5 inches | | Is Discontinued By Manufacturer | No | | Item Package Quantity | 1 | | Batteries Included? | No | | Batteries Required? | No | ## Product Details - **Brand:** Santacary - **Sensor Type:** Electrochemical - **Manufacturer:** Santacary ## Images ![HCHO Index Monitor, Formaldehyde (Oxymethylene) Temperature and Humidity Air Quality Pocket Indicator [FH20] Accurate AQI Datalogger Indoor Detector *Two-year Warranty* - Image 1](https://m.media-amazon.com/images/I/61k850Y9n5L.jpg) ![HCHO Index Monitor, Formaldehyde (Oxymethylene) Temperature and Humidity Air Quality Pocket Indicator [FH20] Accurate AQI Datalogger Indoor Detector *Two-year Warranty* - Image 2](https://m.media-amazon.com/images/I/91T9faY663L.jpg) ![HCHO Index Monitor, Formaldehyde (Oxymethylene) Temperature and Humidity Air Quality Pocket Indicator [FH20] Accurate AQI Datalogger Indoor Detector *Two-year Warranty* - Image 3](https://m.media-amazon.com/images/I/71byCidQnbL.jpg) ![HCHO Index Monitor, Formaldehyde (Oxymethylene) Temperature and Humidity Air Quality Pocket Indicator [FH20] Accurate AQI Datalogger Indoor Detector *Two-year Warranty* - Image 4](https://m.media-amazon.com/images/I/51WkwLYsBkL.jpg) ![HCHO Index Monitor, Formaldehyde (Oxymethylene) Temperature and Humidity Air Quality Pocket Indicator [FH20] Accurate AQI Datalogger Indoor Detector *Two-year Warranty* - Image 5](https://m.media-amazon.com/images/I/711nAUkEa7L.jpg) ## Customer Reviews ### ⭐⭐⭐⭐ Sensitive to cross contamination but consistent readings once you know how to adjust them. *by A***R on Reviewed in the United States on June 14, 2015* I read a lot of reviews before choosing this handheld, and decided to go for it and return it if it didn't work. It is easy to use and the battery lasts a long time (multiple days). So does it work? Yes, but the readings seem to be higher than your actual formaldehyde levels. I sort of freaked out at the first readings -- like .7 or .9 ppms until I got accustomed to it. It works by diffusion and is very (cross) sensitive to alcohols (cooking chicken with white wine, spraying lysol in a room, or a closed cabinet with makeup and hair products) which it does explain in the instruction booklet. Does it sense formaldehyde? I had the opportunity to hold it side-by-side a "real" commercial grade sniffer and mine measured consistently .6 - .8 ppms higher than that one, so I think mine is just picking up more cross-contamination. Once you know that, I think it is reliable to show you your levels in one location relative to another -- and you can also see how levels increase with increasing temperature and humidity. I did get it to register close to 0 ppm outside on a very cool breezy (~62 degree) morning. ### ⭐⭐⭐⭐⭐ Works as advertised. *by W***K on Reviewed in the United States on July 3, 2015* Very useful for the price. ### ⭐⭐ The number goes up and down erratically in the same ... *by L***H on Reviewed in the United States on March 8, 2015* The number goes up and down erratically in the same place. Looks cheaply made from China. The led lights are not in the correct place. --- ## 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.vu/products/14401637-hcho-index-monitor-formaldehyde-oxymethylene-temperature-and-humidity-air-quality](https://www.desertcart.vu/products/14401637-hcho-index-monitor-formaldehyde-oxymethylene-temperature-and-humidity-air-quality) --- *Product available on Desertcart Vanuatu* *Store origin: VU* *Last updated: 2026-05-07*