---
product_id: 1593151
title: "unisex adult Pocket science lab ph meters, Brown, Without Digital Thermometer US"
brand: "hm digital"
price: "4984 som"
currency: KGS
in_stock: true
reviews_count: 11
url: https://www.desertcart.kg/products/1593151-unisex-adult-pocket-science-lab-ph-meters-brown-without-digital
store_origin: KG
region: Kyrgyzstan
---

# Instant TDS reading in ppm 0.55x0.9x5.5 in compact size 1000 hrs battery life unisex adult Pocket science lab ph meters, Brown, Without Digital Thermometer US

**Brand:** hm digital
**Price:** 4984 som
**Availability:** ✅ In Stock

## Summary

> 💧 Know your water, own your wellness.

## Quick Answers

- **What is this?** unisex adult Pocket science lab ph meters, Brown, Without Digital Thermometer US by hm digital
- **How much does it cost?** 4984 som with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kg](https://www.desertcart.kg/products/1593151-unisex-adult-pocket-science-lab-ph-meters-brown-without-digital)

## Best For

- hm digital enthusiasts

## Why This Product

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

## Key Features

- • **Smart Battery Efficiency:** Auto-off after 10 mins conserves alkaline battery power for 1000+ hours
- • **Versatile Application Ready:** Perfect for aquaculture, hydroponics, water filtration & more
- • **Instant Water Quality Insight:** Advanced microprocessor delivers real-time TDS readings in ppm
- • **Precision Pocket-Sized Purity:** Sleek, lightweight design fits your on-the-go lifestyle
- • **User-Friendly Freeze Function:** Hold your measurement to analyze results anytime, anywhere

## Overview

The HM Digital TDS-4 is a compact, pocket-sized water purity tester that instantly measures Total Dissolved Solids (TDS) in ppm using advanced microprocessor technology. Designed for professionals and enthusiasts alike, it features automatic temperature compensation, a hold function to freeze readings, and an auto-off feature to extend battery life up to 1000 hours. Ideal for water purification, hydroponics, aquaculture, and more, this sleek, battery-included device empowers you to monitor water quality anytime, anywhere.

## Description

Product Description               Product Description: How Pure is Your Water? A TDS meter (aka ppm pen, nutrient tester, tds stick) is an inexpensive and convenient digital tool to instantly check your overall water quality. TDS = Total Dissolved Solids, which is any salt, metal or mineral in the water. With the push of a button, the TDS-4 can tell you your overall water purity level, which will be displayed on the screen in ppm (parts per million). The lower the TDS level, the purer the water, with 0 ppm being pure H2O. The TDS-4 is great for checking your tap water quality, or knowing when to change a filter. (The meter does not test for biological contaminants.) The TDS-4 is a great tool for drinking water, water filtration and purification, hydroponics (test your nutrients), colloidal silver, aquariums, RO/DI systems, pools and spas, and more.                  From the Manufacturer               TDS Tester with Advanced Microprocessor Technology.

## Features

- plastic
- Imported
- This TDS tester is ideal for all water purification applications, wastewater regulation, aquaculture, hydroponics, and colloidal silver
- ATC (Automatic Temperature Compensation) ; Advanced microprocessor technology
- The Sleek design of the TDS-4 is perfect for personal or commercial use
- Alkaline batteries included
- Hold Function: Freeze the measurement to view it out of the water.
- Auto-off function: the meter shuts off automatically after 10 minutes of non-use to conserve batteries

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | HM Digital, Inc. |
| Part Number | TDS-4 |
| Item Weight | 1.58 ounces |
| Product Dimensions | 0.55 x 0.9 x 5.5 inches |
| Item model number | TDS-4 |
| Batteries | 2 LR44 batteries required. (included) |
| Is Discontinued By Manufacturer | No |
| Size | Without Digital Thermometer |
| Color | Brown |
| Style | Pocket |
| Material | Silver |
| Pattern | Solid |
| Item Package Quantity | 1 |
| Temperature Range | 1/50 Degrees Celsius |
| Display Style | LCD |
| Batteries Included? | Yes |
| Batteries Required? | Yes |
| Battery Cell Type | Alkaline |
| Average Battery Life | 1000 Hours |

## Images

![unisex adult Pocket science lab ph meters, Brown, Without Digital Thermometer US - Image 1](https://m.media-amazon.com/images/I/71JOhreWXbL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Simple, accurate, and cheap.  Winner!
  

*by P***R on Reviewed in the United States on March 8, 2015*

It is very simple to use.  Here are the instructions from the packaging:1.  Remove the protective cap2.  Turn the TDS meter on.  The on/off switch is one of the buttons clearly visible on the front of the device below the digital readout.3.  Immerse the meter into the water / solution up to the maximum immersion level (2 inches)4.  Wait until the display stabilizes.  This takes about 10-30 seconds.  If you can't read it while this is happening, then push the "hold" button and it will hold the reading after you take it out of the water.Like many others I bought this to test the effectiveness of our reverse osmosis water purification system. Worked for that job perfectly and very easily.  I first used it in late Aug 2014 when we hooked up our new system.  The tap water was at 118 ppm, the water from a brita pitcher was at 68 ppm, and the RO produced water was 30 ppm.  A few days later I did it again and got nearly identical numbers (120, 74, 32).  Never touched it again until today, 3/8/15 when the tap measured 119 ppm and the RO-treated water was at 8 ppm.  Maybe the filter performance improved after they were used a little bit, not sure.  Regardless, this device is very simple, super accurate, and really cheap--what more can you ask for?

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Inexpensive, simple, functional
  

*by C***E on Reviewed in the United States on March 20, 2017*

I was a bit skeptical, to be honest. But this simple and inexpensive tds meter seems to work.  Out of the box, I stuck it in distilled water.  It read 1 ppm - accurately, in other words.  Water from my tap (from a deep well) read 190 ppm; the same water from a brita filter read 95 ppm; and my Crystal Geyser water from a gallon jug read 65 ppm.I got this to get a general idea of the water quality for my espresso machine, shooting for 75 to 100 ppm to minimize scaling but still have sufficient dissolved solids/minerals for good extraction and to trigger the water level sensor on my dual boiler setup. I now mix the CG jugged water and brita water to hit my targeted range, and check with this meter. Which is easy to do: press the on/off button, stick the business end of the sensor about one inch into the water reservoir on my espresso machine, press the 'hold' button, remove to read, shut it off.Is it accurate enough for mission critical work? Who knows.  It does seem consistent enough to help me monitor water quality for my purposes, and for the price, that's plenty good enough.

### ⭐⭐⭐⭐ 4.0 out of 5 stars







  
  
    Works great, has infrequent inaccurate readings
  

*by T***. on Reviewed in the United States on March 24, 2022*

Not sure what to expect from a 20 dollar tps meter, but it performs as advertised... I think... Most of the time, at least.I bought the 342 ppm calibration liquid to double check this meter, I never get readings that are more than 5-10 ppm off. It really is always in calibration and it comes that way from the factory. For me that's accurate enough. But, there are times when I get readings that are off by 50-60 ppm just by retesting the same water after 5 second (it's not from off gassing, this happens on water fresh from my tap AND water in my aquarium that's). Then there are times when I test 4 or 5 times in a row and get readings with only 2ppm variation.So take this info/review for whatever you think it's worth. This meter WILL come factory calibrated and it almost always gives you relatively accurate readings regardless of water temperature, but it won't ALWAYS give you dead on ppm readings

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*Product available on Desertcart Kyrgyzstan*
*Store origin: KG*
*Last updated: 2026-03-02*