Look here to compare the features of United Electric pressure, differential pressure, and temperature switches.

Differential Pressure Switches

UE 21 Series NEMA 4X Differential Pressure Switches
UE 24 Series Delta-Pro General Service Differential Pressure Switches
UE 100 Series NEMA 4X Differential Pressure Switches
UE 120 Series Explosion-Proof Differential Pressure Switches
UE 400 Series Multiswitch NEMA 4X Differential Pressure Switches
UE Differential Pressure Switches for Ultra-Low Pressures
UE Spectra 12 Vibration-Resistant Differential Pressure Switches for Div 1 Zone 1 Hazardous Environments
UE One Series Electronic Switches for Pressure, Temperature, and Differential Pressure
United Electric One Series Differential Pressure Safety Transmitter and Switch

Flow Switches

Kobold USA Flowmeters
Kobold USA Flow Transmitters
Siemens Milltronics OCM-III Open Channel Flowmeter
Siemens Milltronics EnviroRanger ERS500 System
Siemens Milltronics HydroRanger Flow and Level Monitoring System
Siemens Milltronics MultiRanger Solid/Liquid Ultrasonic System
RCM Industries Direct-Reading Flowmeters

Level Switches

Siemens Milltronics CLS100 Capacitance Point Level Switch
Siemens Milltronics CLS200 Capacitance Point Level Switch
Siemens Milltronics CLS300 Capacitance Point Level Switch
Siemens Milltronics CLS500 Capacitance Point Level Switch for Harsh Applications
Siemens Milltronics EnviroRanger ERS500 System
Siemens Milltronics HydroRanger Flow and Level Monitoring System
Siemens SITRANS LC300 Capacitance Continuous Level Transmitter
Siemens SITRANS LC500 Capacitance Continuous Level Transmitter for Critical Applications
Siemens SITRANS LG200 Guided Wave Radar Transmitter
Siemens SITRANS LPS200 Rotary Paddle Switch for Bulk Solids Level
Siemens SITRANS LR250 Two-Wire Pulse Radar for Continuous Level Monitoring of Liquids and Slurries
Siemens SITRANS LR260 Two-Wire Pulse Radar Transmitter for Dusty Solids
Siemens SITRANS LR400 Microwave Radar Level Switch
Siemens SITRANS LR460 Radar Transmitter for Continuous Level Monitoring of Bulk Solids and Powders
Siemens SITRANS LR560 High Frequency Loop-Powered Radar Level Transmitter for Continuous Solids Level Monitoring
Siemens SITRANS LVS200 Vibrating Fork Level Switch for Bulk Solids Level
Siemens Milltronics ULS200 Ultrasonic Point Level Switch
Siemens Milltronics Probe Ultrasonic Continuous Liquid Level Switch
Siemens Milltronics MultiRanger Single-Channel Solid/Liquid Ultrasonic System
Siemens SITRANS LU01 Single Point Long Range Ultrasonic Transceiver (was Milltronics AiRanger SPL)
Siemens SITRANS LU02 Dual-Channel Solid/Liquid Ultrasonic Transceiver (was Milltronics AiRanger DPL Plus)
Siemens SITRANS LU10 Multichannel Solid/Liquid Ultrasonic Transceiver (was Milltronics AiRanger XPL Plus)
Kobold Simple Contact (Float) Switches

Motion (See Also... Motion and Speed Sensors) Switches

Siemens Milltronics MFA-4* Motion Failure Alarms
Siemens Milltronics ZSS Zero Speed Switch

Pressure/Vacuum Switches

UE J6 Series NEMA 4X Pressure Switches
UE 40 Series General Service Pressure Switches
UE 54 Series General Service Pressure Switches
UE 100 Series NEMA 4X Pressure Switches
UE 117 Series Hazardous Location (Div. 2) Pressure Switches
UE 120 Series Explosion-Proof Pressure Switches
UE 400 Series Multiswitch NEMA 4X Pressure Switches
UE Spectra 10 Compact Cylindrical Pressure Switches
UE Spectra 12 Vibration-Resistant Compact Pressure Switches
UE Pressure Switches with Integral Chemical Seals
UE 3A-Approved Pressure Switches for Clean Processes
UE Ultra Low Pressure Switches for Vacuum Conditions and Harsh Environments
UE One Series Electronic Switches for Pressure, Temperature, and Differential Pressure
United Electric One Series Pressure Safety Transmitter and Switch

SIL-Certified Safety Switches

United Electric One Series Safety Transmitter and Switch

Solid State Switches

United Electric One Series Electronic Switches for Pressure, Temperature, and Differential Pressure
United Electric One Series Safety Transmitter and Switch

Temperature Switches

UE 54 Series General Service Temperature Switches
UE 55 Series NEMA 4 Remote Mount General Service Temperature Switches
UE 100 Series NEMA 4X Temperature Switches
UE 117 Series Explosion-Proof Temperature Switches
UE 120 Series Explosion-Proof Temperature Switches
UE 400 Series Multiswitch NEMA 4X Temperature Switches
UE 800 Series Indicating Temperature Switches
UE Spectra 12 Temperature Switch with Bulb and Capillary System
UE One Series Electronic Temperature Switches
United Electric One Series Temperature Safety Transmitter and Switch

No Longer Available (For Reference Only)

Milltronics InterRanger DPS300 Interface Level Monitoring System
Milltronics Miniranger Plus Single-Channel Ultrasonic Level Transmitter
Milltronics AiRanger SPL Single-Point, Long Range Ultrasonic Transmitter
Milltronics AiRanger DPL Plus Dual-Channel, Solid/Liquid Ultrasonic Transmitter
Milltronics AiRanger XPL Plus Multichannel Solid/Liquid Ultrasonic Transmitter
Milltronics HydroRanger Plus Wastewater Monitoring and Control System
Milltronics IQRadar 300 Microwave Radar Level Transmitter
Milltronics Mercap Capacitance Continuous Level Transmitter
UE 105 Series NEMA 4X Switches for Pressure, Differential Pressure, and Temperature
UE 25 Series Pressure Switch with Adjustable Setpoint and Deadband