HM Digital TDS-3 Pen Style TDS/Temp Meter - 0-9990 ppm - With Carrying Case

Check Nutrient Strength and Water Temperature in Seconds - 0-9990 ppm Range

Guessing at nutrient concentration leads to feeding mistakes. This pen style meter reads total dissolved solids and water temperature in one dip, so you can confirm reservoir strength before you adjust. Automatic temperature compensation keeps readings consistent as water temperature changes, and it is factory calibrated and can be recalibrated with a mini-screwdriver.

This is a single handheld unit sold each. It suits home growers who want a dependable everyday check, and it also works as a portable spot-check tool for commercial growers who test several reservoirs or water sources.

Key Features & Benefits

• Wide TDS range — reads 0 to 9990 ppm (mg/L), covering low-strength water through concentrated solutions.
• Built-in thermometer — shows water temperature from 0 to 80 degrees Celsius in 0.1 degree steps.
• Hold function — freezes the reading so you can lift the meter out of the water and read it.
• Auto-off after 10 minutes — saves battery life if you forget to switch it off.
• Carrying case with belt clip — protects the meter in a toolbox and keeps it within reach.

Who Should Use HM Digital TDS-3

Use it if you manage hydroponic systems, mix nutrient solutions, or monitor water quality before and after treatment. It suits both hobby setups and licensed commercial operations that need a compact, portable meter.

About HM Digital TDS-3

The HM Digital TDS-3 is a handheld TDS and temperature meter. It has an accuracy of +/- 2%, uses an NaCl conversion factor (average 0.5), and runs on 2 x 1.5V button cell batteries (LR44 or equivalent), which are included. Rated battery life is 1000 hours of usage.

Frequently Asked Questions

Q: What does TDS mean?
A: TDS stands for total dissolved solids, the amount of dissolved material in water, shown in parts per million (ppm). In hydroponics it gives a quick indication of nutrient solution strength.

Q: Does it measure temperature too?
A: Yes. It has a built-in digital thermometer that reads from 0 to 80 degrees Celsius with 0.1 degree resolution. Temperature is shown in Celsius only.

Q: Do I need to calibrate it before use?
A: No, it ships factory calibrated with a 342 ppm NaCl solution. If you want to recalibrate it later, you can adjust it with a mini-screwdriver.

Q: What does the x10 icon mean?
A: Readings from 0 to 999 ppm display in 1 ppm steps. From 1000 to 9990 ppm the resolution is 10 ppm, and the x10 icon indicates that range.

Q: What batteries does it use and are they included?
A: It uses two 1.5V button cell batteries (LR44 or equivalent). Batteries are included.

Q: Does it compensate for water temperature?
A: Yes. A built-in sensor provides automatic temperature compensation across 1 to 50 degrees Celsius, so readings stay comparable across different water temperatures.