MMP is an authorised distributor of HM DIGITAL INC, USA for their range of Hand Held Instruments. The products include, TDS, Conductivity, pH and ORP meters. These products are offered in different capacities and configurations. The high end products of HM are some of the most accurate instruments that are commercially available in the world.

Item CodeItemRangeAccuracyResolution
TDS-3TDS Meter with inbuilt thermometer
(Comes with Vinyl Case)
0-9990ppm
0-80°C
+/-2%1ppm
1°C
TDS-EZTDS Meter Economy model0-9990ppm+/-3%1ppm
AP-1Aquapro TDS Meter with inbuilt thermometer. Water resistant casing and magnetic0-5000ppm
0-80°C
32-176°F
+/-2%1ppm
0.1°C
0.1F
AP-2Aquapro Electrical Conductivity (EC) Meter with inbuilt thermometer.
Water resistant casing and magnetic
0-9999μs
0-80°C
32-176°F
+/-2%1μs
0.1°C
0.1°F
COM-100TD/EC/Temperature
Combo Meter
Waterproof (IP-67 Rating)
Replaceable sensors
0-8560ppm
0-9999μs
0-80°C
32-176°
+/-2%0.1ppm
0.1μs
0.1°C
0.1°F
pH-80pH Meter Economy Model0-14pH
1-80°C
33-176°F
+/-0.2pH
+/-2%
0.1pH
0.1°C
0.1°F
pH-200pH Meter
Waterproof (IP 67 Rating)
Replaceable sensors
0-14pH
0-80°C
32-176°F
+/-0.02pH
+/-2%
0.01pH
0.1°C
0.1°F
ORP-200ORP Meter
Waterproof (IP 67 Rating)
Replaceable sensors
-999 to 1000mv
0-80°C
32-176°F
+/-2mV
0.5%
1mV
0.1°C
0.1°F