Manufacture of non-electronic instruments and appliances for measuring, testing and navigation, except industrial process control equipment - SIC Code 26513

What falls under it

131 activities classified here.

Straight from the ONS activity index, in their words rather than ours. If what you do appears here, this is your code.

Absorptiometer (non-electronic) (manufacture)
Air navigation instruments and systems (non-electronic) (manufacture)
Aircraft engine instruments (non-electronic) (manufacture)
Altimeter (non-electronic)(manufacture)
Ammeters (non-electronic) (manufacture)
Artificial horizon (non-electronic) (manufacture)
Automatic pilots (non-electronic) (manufacture)
Automotive emissions testing equipment (non-electronic) (manufacture)
Balancing machines (non-electronic) (manufacture)
Barometer (non-electronic) (manufacture)
Calculating instruments (non-electronic) (manufacture)
Callipers (manufacture)
Checking instruments and appliances (non-electronic) (manufacture)
Colorimeters (non-electronic) (manufacture)
Comparators (non-electronic) (manufacture)
Compass (drawing) (manufacture)
Compass (magnetic) (manufacture)
Compressibility testing equipment (non-electronic) (manufacture)
Counting instruments (non-electric) (manufacture)
Density measuring optical equipment (non-electronic) (manufacture)
Drafting tables and machines (manufacture)
Drawing instrument (manufacture)
Elasticity testing equipment (non-electronic) (manufacture)
Electricity meter (non-electronic) (manufacture)
Environmental controls and automatic controls for appliances (non-electronic) (manufacture)
Equipment for testing physical and mechanical properties of materials (non-electronic) (manufacture)
Expansion meter (non-electronic) (manufacture)
Flame and burner control (non-electronic) (manufacture)
Flow measuring and control instrument (non-electronic) (manufacture)
Flow meters (non-electronic) (manufacture)
Fluorimeter (non-electronic) (manufacture)
Frequency meter (non-electronic) (manufacture)
Galvanometer (manufacture)
Gas chromatograph (manufacture)
Gas meter (non-electronic) (manufacture)
Gauge (non-electronic) (manufacture)
Geophysical instruments and appliances (non-electronic) (manufacture)
GPS devices (non-electronic) (manufacture)
Gunnery control instrument (non-electronic) (manufacture)
Hardness testing instrument (non-electronic) (manufacture)
Heat meters (non-electronic) (manufacture)
Humidistats (non-electronic) (manufacture)
Hydrographic instrument and apparatus (non-electronic) (manufacture)
Hydrological instrument (non-electronic) (manufacture)
Hydrometers (non-electronic) (manufacture)
Hydronic limit controls (non-electronic) (manufacture)
Instruments for Vitro Diagnosis (non-electronic) (manufacture)
Laboratory analytical instruments (non-electronic) (manufacture)
Laboratory incubators and sundry lab apparatus for measuring, testing (non-electronic) (manufacture)
Laboratory type sensitive balances (non-electronic) (manufacture)
Level gauges (non-electronic) (manufacture)
Level measuring and control instruments (non-electronic) (manufacture)
Liquid filled thermometer (non-medical) for direct reading (manufacture)
Liquid supply meter (non-electronic) (manufacture)
Magnetic compass (manufacture)
Manometers (non-electronic) (manufacture)
Mathematical instrument (non-electronic) (manufacture)
Measuring instruments and appliances (non-electronic) (manufacture)
Metal detectors (non-electronic) (manufacture)
Meteorological instruments (non-electronic) (manufacture)
Meteorological optical instruments (non-electronic) (manufacture)
Meters (other than for electricity and parking) (non-electronic) (manufacture)
Meters for electricity (non-electronic) (manufacture)
Meters for liquid supply (non-electronic) (manufacture)
Meters for petrol pumps (non-electronic) (manufacture)
Meters for water (non-electronic) (manufacture)
Micrometer (manufacture)
Microscopes (other than optical) (manufacture)
Mine detectors (non-electronic) (manufacture)
Mine detectors, pulse (signal) generators; metal detectors (manufacture)
Mitre (manufacture)
Motion detectors (non-electronic) (manufacture)
Nautical instrument (non-electronic) (manufacture)
Navigational instruments and appliances (non-electronic) (manufacture)
Non-electrical apparatus for testing physical and mechanical properties of materials (manufacture)
Numerical control and indication equipment for machine tools (non-electronic) (manufacture)
Oceanographic or hydrological instruments (non-electronic) (manufacture)
Ohmmeter (manufacture)
Optical density measuring equipment (non-electronic) (manufacture)
Optical type measuring and checking appliances and instruments (non-electronic) (manufacture)
Pedometers (non-electronic) (manufacture)
Ph meters (non-electronic) (manufacture)
Photogrammetric equipment (non-electronic) (manufacture)
Photometers (non-electronic) (manufacture)
Physical properties testing and inspection equipment (non-electronic) (manufacture)
Pneumatic gauges (non-electronic) (manufacture)
Polarimeters (non-electronic) (manufacture)
Polygraph machines (non-electronic) (manufacture)
Porosimeter (manufacture)
Potentiometric recorder (non-electronic) (manufacture)
Precision balance (non-electronic) (manufacture)
Precision drawing instrument (manufacture)
Pressure measuring and control instrument (non-electronic) (manufacture)
Pulse (signal) generators (non-electronic) (manufacture)
Pyrometer (non-electronic) (manufacture)
Radiation equipment and detection instruments (non-electronic) (manufacture)
Range finders (non-electronic) (manufacture)
Range finders (optical non-electronic) (manufacture)
Refractometers (non-electronic) (manufacture)
Revolution counters (non-electronic) (manufacture)
Ribonucleic acid (RNA) extractors (non-electronic) (manufacture)
Scientific laboratory equipment (non-electrical or non-optical) (manufacture)
Seismometers (non-electronic) (manufacture)
Sextant (non-electronic) (manufacture)
Slide rules (manufacture)
Spectrofluorimeter (non-electronic) (manufacture)
Spectrograph (non-electronic) (manufacture)
Spectrometers (non-electronic) (manufacture)
Speedometers (non-electronic) (manufacture)
Spirit level (manufacture)
Stroboscope (manufacture)
Surface tension instruments (non-electronic) (manufacture)
Surveying instruments (non-electronic) (manufacture)
Surveying instruments (optical non-electronic) (manufacture)
Tachometer (non-electronic) (manufacture)
Tally counters (non-electronic) (manufacture)
Taximeters (non-electronic) (manufacture)
Temperature measuring and control instrument (non-electronic) (manufacture)
Test benches (non-electronic) (manufacture)
Testing instruments and appliances (non-electronic) (manufacture)
Theodolite (non-electronic) (manufacture)
Thermometer (non-electronic) (manufacture)
Thermostat (non-electronic) (manufacture)
Ultrasonic sounding instruments (non-electronic) (manufacture)
Vehicle motors testing and regulating apparatus (non-electronic) (manufacture)
Velocity measuring instruments (non-electronic) (manufacture)
Viscometers (non-electronic) (manufacture)
Voltmeter (non-electronic) (manufacture)
Water meters (non-electronic) (manufacture)
Watt meter (non-electronic) (manufacture)
Wheel balancing machine (non-electronic) (manufacture)