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- USA
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Ships within 48 hours · Estimated delivery Jul 8 - Jul 13
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Description
HM Digital Hydromaster 500 - Continuous pH/TDS/EC/Temp meterHM 500 HydroMaster: EC TDS, pH, Temp Continuous Monitor The HM 500 is the most versatile continuous monitor indicating EC TDS, pH, and Temp providing accurate, stable readings the user can rely on. With its rechargeable battery this unit is portable or can be wall mounted.. To make is even more user friendly, it comes equipped with touch screen, high and low alarm set points, and recorded readings. It is ideal for hydroponics and other applications
HM-500 HydroMaster: EC/TDS, pH, Temp Continuous Monitor
The HM-500 is the most versatile continuous monitor indicating EC/TDS, pH, and Temp providing accurate, stable readings the user can rely on. With its rechargeable battery this unit is portable or can be wall mounted.. To make is even more user friendly, it comes equipped with touch screen, high and low alarm set points, and recorded readings. It is ideal for hydroponics and other applications such as lab, pools, aquariums etc.
Features
Continuous pH/EC/TDS/Temp Monitor
Rechargeable battery
RF Resistant
Portable/Wall Mount/Benchtop
Data Storage: Up to 20 measurement readings
Auto Shut-Off: After 5 minutes
Alarm: Adjustable High & Low Set Point and on/off
Display: LCD Touch-Type Screen with Auto Back lighting
Probe: ABS with Platinum electrodes for EC / Single Junction pH Sensor
Three Year Warranty
Specifications
Measurement Scales
pH: pH
Temp: °C, °F
TDS: ppm (0.5 / ppm (0.7) / ppt (0.5) / ppt (0.7)
EC: µS / mS
Range: pH: 0.00 – 14.00 pH
Temperature: 0.0 – 80.0 °C / 32.0 – 176 °F
TDS: 0 – 9999 ppm / 0 – 10.00 ppt
EC: 0 – 9999 µS / 0 – 20.00 mS
Resolution:
pH: 0.1 pH
Temp: 0.1°C / 0.1 °F
TDS: ppm: 0.1ppm (0 – 99.9ppm) / 1 ppm (100-999ppm) / 10ppm (1000-9990 ppm) ppt: 0.01 ppt (0.01 – 10.00 ppt)
EC: µS: 0.1 µS (0 – 99.9 µS) / 1 uS (100 – 999 µS) / 10µS (1000-9990 µS) mS: 0.01 mS (0.01 – 20.00 mS)
ATC: Yes
Accuracy: pH: ± 0.1 pH
Temp: ± 1 °C / °F
TDS: ± 2 %
EC: ± 2 %
Power Source: AC 110 V – 220V / Rechargeable Lithium Ion Battery
Function Environment: 0 – 50°C (0-122°C) / RH 80 % (EC Probe: 0 – 80°C)
Sensor Cable: 24-inch shielded Coaxial Cable
Dimensions: About 8 x 4 x 1.5 inches
Weight: 15.2 ounces for body / 5 ounces for two probes (without case)
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.3 ★★★★★
Based on 2474 reviews
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Product Reviews
★★★★★ 1
Toxic ingredients
Size: 2 Fl Oz (Pack of 1)
There are endocrine disruptors in here that are harmful to your health. I nearly got to the point of being disabled from endocrine issues. Has ingredients that ruin fertility, raise risk of cancer, and ruin your endocrine system. I hope these brands can take these ingredients out and begin to care about consumers health.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 21, 2026
★★★★★ 5
Returning customer! :-)
Size: 2 Fl Oz (Pack of 1)
I love this product. The size is perfect, it smells amazing, and my skin has no reaction to it whatsoever (aside from what it’s supposed to do). So just a little background, my mother is Caucasian- my father is African American. I can either get a sun burn or get super tan- all depends on what products I use while under the sun.
In the past, low quality products have given me a sunburn over a period of long sun exposure. Contrary to that, high quality products require me to apply less and will prevent me from sunburns. I do have to reapply, depending how much sun exposure I am getting.
I originally purchased this product for a week long trip to Mexico with my boyfriend. I only bought 2 bottles- and we spent A LOT of time on the beach/ getting sun. We both used the sunscreen and STILL HAD LEFTOVERS after our trip (half a bottle still full). In addition, neither of us got sunburns- he got a nice sun kissed glow and I got a tan!
It is TSA carry-on approved, very lightweight, and easy to use. I would recommend this product to anyone who asks! 10/10 will repurchase again :-)
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 20, 2024
★★★★★ 5
Works & smells great!
Size: 6 Fl Oz (Pack of 1)
Works & smells great!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 24, 2026
★★★★★ 5
Great smell
Size: 2 Fl Oz (Pack of 1)
Smells amazing, and goes on clear
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 1, 2026
★★★★★ 5
“Holy Sun Protection, Batman! This Stuff Works!” 🦇🦸♂️
Size: 6 Fl Oz (Pack of 1)
The COOLA Organic Sunscreen SPF 50 Sunblock is the real deal. It goes on smooth, absorbs quickly, and doesn’t leave behind that greasy, chalky layer most sunscreens do. I put it to the test during a full day outdoors, and it held strong—no burns, no irritation, just solid protection.
What makes it even better is the formula: not overloaded with harsh chemicals, but still highly effective. It feels more like skincare than sunscreen, which makes reapplying far less of a chore.
If Batman and Robin swapped their capes for beach towels, this would be the sunblock in their utility belts—powerful protection, clean ingredients, and a formula that actually works when the heat is on. 🦇☀️
Would you like me to also create short funny one-liner summaries for each review (like quick taglines), so you have both the full review and a quick punchy line to use?
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Reviewed in the United States on August 19, 2025
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