HM Digital Pro Series Pen style ORP/Temp meter

Pen-Style ORP/Temp Meter, -999 to +1000mV

Checking oxidation-reduction potential doesn't need a full benchtop setup when you're spot- checking a reservoir or treatment system. The HM Digital Pro Series Pen style ORP/Temp meter packs a -999 to +1000mV ORP range into a compact handheld pen.

Sold as one HM Digital Pro Series ORP-200 pen meter.

Key Features & Benefits

• ORP range: -999 to +1000mV — 1mV resolution with ±0.5% (±2mV) accuracy.
• Includes temperature readout — 0.1°C/F resolution alongside the ORP reading.
• Compact pen-style design — 7.3 x 1.3 x 1.3in, 3.4oz, built for quick spot checks.
• Long battery life — 3x1.5V button cell batteries rated for approximately 1000 hours of use.

Who Should Use the HM Digital ORP-200

This fits growers and water-treatment operators who want a compact, pocket-sized meter for quick ORP spot checks on reservoirs or treatment systems.

About the HM Digital Pro Series ORP-200

The ORP-200 is a compact pen-style meter for ORP and temperature spot checks, covering -999 to +1000mV with long battery life.

Frequently Asked Questions

What ORP range does this pen meter cover?

It covers -999 to +1000mV with 1mV resolution and ±0.5% (±2mV) accuracy. That range covers the ORP readings typical of reservoir and water-treatment monitoring.

Does this meter also read temperature?

Yes, it includes a temperature readout at 0.1°C/F resolution alongside the ORP measurement. Having both on one pen meter avoids carrying a separate thermometer for spot checks.

How long does the battery last?

It runs on 3x1.5V button cell batteries (LR44 or equivalent) rated for approximately 1000 hours of use. That's a long runtime for a compact pen-style meter used for periodic spot checks.

How portable is this meter?

It's a compact pen-style design measuring 7.3 x 1.3 x 1.3 inches and weighing 3.4oz. That size makes it easy to carry in a pocket or tool bag between checks.