Remote Counter Modules (RCM-100)

Now California Certified for Water & Gas!
New Field Replaceable Battery
New Spring Tension Terminal Blocks for Easier Wiring

The RCM-100 is a remote primary display with ability to communicate with all types of pulse equipped water & gas meter registers. The customers and meter readers can access the meter reading without having access to the water and/or gas meter itself. It is available in single and dual register models for water, with color coding for hot (red) or cold (blue) water usage. 

We are pleased to announce our NEW California Certified Natural Gas RCM-100 with green color coding! The meter reading is displayed on a 8-digit LCD powered by a 3.6 Volt Field Replaceable Lithium battery. The heart of the RCM-100 is a microprocessor which interrogates an encoder or store counts from any pulse type-metering device. The LCD display continually indicates the current meter reading.

Standard Specifications

Specifications are subject to change at any time.  Please contact MARS for the latest specifications.

  • California Certified for Natural Gas
  • Redesigned 3.5mm Programming Jack for High Operational Reliability
  • Field Replaceable Battery to Extend Installed Product Life
  • Reduced Installation Time with Tool-Less Spring Terminal Blocks
  • Enclosure Material: Grey Poly-Carbonate
  • Enclosure: Water-Resistant Wall Mount
  • Cover Material: Clear Poly-Carbonate
  • Circuit Board: Conformal Coated
  • Connection: Spring Terminal Block(s)
  • Dimensions: 2-1/2″ x 4-1/2″ x 1-1/2″
  • Display: Custom 8-Digit LCD
  • Weight: 7.5 oz

The RCM-100 has a communication connector that can only be accessed when the unit cover is removed. This connector allows the dedicated programming device to configure and setup the unit. The case offers sealing against water entry. Cable entry will be by means of a small hole on the base of the case. This must be adequately sealed after installation to maintain the water sealing in those installations that require such protection.

The RCM-100 Single and Dual Unit has an output for connecting to an Automatic Meter Reading device such as RF Transmitters for both.

The serial number, make, device identification, manufacturer and model number are contained on a label that is fixed on the inside of the clear cover that cannot be changed or removed once the unit is installed. The PCB is permanently fixed to the inside of the unit under the label and is not removable.

The unit is equipped to indicate any and all unauthorized tampering with the wire, the meter register, and the security sealed cover. In either instance, a tamper indicator is displayed on the LCD display depicted by a large X at the extreme left of the LCD display. Only the owner or operator can reset and erase the tamper code using the RCM Programmer, as no other device can access the program. With each unit a State Approved Adhesive Security Seal can be used if required for dual tamper protection.

All spools are coated inside and out according to frame specifications and select spools are configured with straightening vanes to minimize or reduce turbulence and allow for conformance with AWWA specifications and recommendations.

Frequently Asked Questions

Yes! All of our models both water & gas are California state certified.

Yes! Output for AMR devices includes RF transmitters, both Fixed Network and Drive-By using either a “Pulse” or “Encoder” Output.

Yes! All RCM-100 models now have field replaceable batteries.

Yes! Tamper Detection indicates any tampering with the wire, register, and the security-sealed cover.

24 AWG wire.  Due to potential project-specific interference, we cannot recommend maximum wire run lengths.

Our NEW 3.5mm Programming Jack allows for longer durability and ease of connection, simplifying your installation.

All RCM-100 models come with a 2 Year Limited Warranty.

Yes! The case offers sealing against water entry and the PCB is coated to prevent moisture-related issues.  Note: Cable entry holes must be sealed after installation to maintain water/moisture resistance.

No. All connections to the unit are now tool-less with our NEW spring tension terminal blocks.

Brochures and Datasheets


Diversified Products Brochure 3.20 MB 846 downloads

MARS Company Diversified Products come in many sizes, lengths and configurations...

RCM-100 Datasheet 558 KB 426 downloads

The RCM-100 is a remote primary display with ability to communicate with all types...



RCM-100 Manual 4.09 MB 1368 downloads

Installation and Operating Instructions for MARS RCM-100. ...

Press Releases

Is your Water Meter Test System ANSI/AWWA C715-18 Compliant?

MARS Company offers the first and only Test Bench Equipment Upgrade Program, enabling customers to upgrade their existing MARS test bench equipment to comply with the ANSI / AWWA C715-18 industry standard.

Is your Meter Shop Certified?

With MARS Maintenance Calibration Certification (MCC), you can protect both MARS and select third-party equipment with calibration, technical assistance, software upgrades, preventative maintenance, training, spares management, and on-site maintenance.